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 GNU GENERAL PUBLIC LICENSE
 **************************
 
                          Version 2, June 1991
      Copyright (C) 1989, 1991 Free Software Foundation, Inc.
      59 Temple Place -- Suite 330, Boston, MA 02111-1307, USA
      
      Everyone is permitted to copy and distribute verbatim copies
      of this license document, but changing it is not allowed.
 
 Preamble
 --------
 
 The licenses for most software are designed to take away your freedom
 to share and change it.  By contrast, the GNU General Public License is
 intended to guarantee your freedom to share and change free
 software--to make sure the software is free for all its users.  This
 General Public License applies to most of the Free Software
 Foundation's software and to any other program whose authors commit to
 using it.  (Some other Free Software Foundation software is covered by
 the GNU Library General Public License instead.)  You can apply it to
 your programs, too.
 
    When we speak of free software, we are referring to freedom, not
 price.  Our General Public Licenses are designed to make sure that you
 have the freedom to distribute copies of free software (and charge for
 this service if you wish), that you receive source code or can get it
 if you want it, that you can change the software or use pieces of it in
 new free programs; and that you know you can do these things.
 
    To protect your rights, we need to make restrictions that forbid
 anyone to deny you these rights or to ask you to surrender the rights.
 These restrictions translate to certain responsibilities for you if you
 distribute copies of the software, or if you modify it.
 
    For example, if you distribute copies of such a program, whether
 gratis or for a fee, you must give the recipients all the rights that
 you have.  You must make sure that they, too, receive or can get the
 source code.  And you must show them these terms so they know their
 rights.
 
    We protect your rights with two steps: (1) copyright the software,
 and (2) offer you this license which gives you legal permission to copy,
 distribute and/or modify the software.
 
    Also, for each author's protection and ours, we want to make certain
 that everyone understands that there is no warranty for this free
 software.  If the software is modified by someone else and passed on, we
 want its recipients to know that what they have is not the original, so
 that any problems introduced by others will not reflect on the original
 authors' reputations.
 
    Finally, any free program is threatened constantly by software
 patents.  We wish to avoid the danger that redistributors of a free
 program will individually obtain patent licenses, in effect making the
 program proprietary.  To prevent this, we have made it clear that any
 patent must be licensed for everyone's free use or not licensed at all.
 
    The precise terms and conditions for copying, distribution and
 modification follow.
 
     TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
   1. This License applies to any program or other work which contains a
      notice placed by the copyright holder saying it may be distributed
      under the terms of this General Public License.  The "Program",
      below, refers to any such program or work, and a "work based on
      the Program" means either the Program or any derivative work under
      copyright law: that is to say, a work containing the Program or a
      portion of it, either verbatim or with modifications and/or
      translated into another language.  (Hereinafter, translation is
      included without limitation in the term "modification".)  Each
      licensee is addressed as "you".
 
      Activities other than copying, distribution and modification are
      not covered by this License; they are outside its scope.  The act
      of running the Program is not restricted, and the output from the
      Program is covered only if its contents constitute a work based on
      the Program (independent of having been made by running the
      Program).  Whether that is true depends on what the Program does.
 
   2. You may copy and distribute verbatim copies of the Program's
      source code as you receive it, in any medium, provided that you
      conspicuously and appropriately publish on each copy an appropriate
      copyright notice and disclaimer of warranty; keep intact all the
      notices that refer to this License and to the absence of any
      warranty; and give any other recipients of the Program a copy of
      this License along with the Program.
 
      You may charge a fee for the physical act of transferring a copy,
      and you may at your option offer warranty protection in exchange
      for a fee.
 
   3. You may modify your copy or copies of the Program or any portion
      of it, thus forming a work based on the Program, and copy and
      distribute such modifications or work under the terms of Section 1
      above, provided that you also meet all of these conditions:
 
        a. You must cause the modified files to carry prominent notices
           stating that you changed the files and the date of any change.
 
        b. You must cause any work that you distribute or publish, that
           in whole or in part contains or is derived from the Program
           or any part thereof, to be licensed as a whole at no charge
           to all third parties under the terms of this License.
 
        c. If the modified program normally reads commands interactively
           when run, you must cause it, when started running for such
           interactive use in the most ordinary way, to print or display
           an announcement including an appropriate copyright notice and
           a notice that there is no warranty (or else, saying that you
           provide a warranty) and that users may redistribute the
           program under these conditions, and telling the user how to
           view a copy of this License.  (Exception: if the Program
           itself is interactive but does not normally print such an
           announcement, your work based on the Program is not required
           to print an announcement.)
 
      These requirements apply to the modified work as a whole.  If
      identifiable sections of that work are not derived from the
      Program, and can be reasonably considered independent and separate
      works in themselves, then this License, and its terms, do not
      apply to those sections when you distribute them as separate
      works.  But when you distribute the same sections as part of a
      whole which is a work based on the Program, the distribution of
      the whole must be on the terms of this License, whose permissions
      for other licensees extend to the entire whole, and thus to each
      and every part regardless of who wrote it.
 
      Thus, it is not the intent of this section to claim rights or
      contest your rights to work written entirely by you; rather, the
      intent is to exercise the right to control the distribution of
      derivative or collective works based on the Program.
 
      In addition, mere aggregation of another work not based on the
      Program with the Program (or with a work based on the Program) on
      a volume of a storage or distribution medium does not bring the
      other work under the scope of this License.
 
   4. You may copy and distribute the Program (or a work based on it,
      under Section 2) in object code or executable form under the terms
      of Sections 1 and 2 above provided that you also do one of the
      following:
 
        a. Accompany it with the complete corresponding machine-readable
           source code, which must be distributed under the terms of
           Sections 1 and 2 above on a medium customarily used for
           software interchange; or,
 
        b. Accompany it with a written offer, valid for at least three
           years, to give any third party, for a charge no more than your
           cost of physically performing source distribution, a complete
           machine-readable copy of the corresponding source code, to be
           distributed under the terms of Sections 1 and 2 above on a
           medium customarily used for software interchange; or,
 
        c. Accompany it with the information you received as to the offer
           to distribute corresponding source code.  (This alternative is
           allowed only for noncommercial distribution and only if you
           received the program in object code or executable form with
           such an offer, in accord with Subsection b above.)
 
      The source code for a work means the preferred form of the work for
      making modifications to it.  For an executable work, complete
      source code means all the source code for all modules it contains,
      plus any associated interface definition files, plus the scripts
      used to control compilation and installation of the executable.
      However, as a special exception, the source code distributed need
      not include anything that is normally distributed (in either
      source or binary form) with the major components (compiler,
      kernel, and so on) of the operating system on which the executable
      runs, unless that component itself accompanies the executable.
 
      If distribution of executable or object code is made by offering
      access to copy from a designated place, then offering equivalent
      access to copy the source code from the same place counts as
      distribution of the source code, even though third parties are not
      compelled to copy the source along with the object code.
 
   5. You may not copy, modify, sublicense, or distribute the Program
      except as expressly provided under this License.  Any attempt
      otherwise to copy, modify, sublicense or distribute the Program is
      void, and will automatically terminate your rights under this
      License.  However, parties who have received copies, or rights,
      from you under this License will not have their licenses
      terminated so long as such parties remain in full compliance.
 
   6. You are not required to accept this License, since you have not
      signed it.  However, nothing else grants you permission to modify
      or distribute the Program or its derivative works.  These actions
      are prohibited by law if you do not accept this License.
      Therefore, by modifying or distributing the Program (or any work
      based on the Program), you indicate your acceptance of this
      License to do so, and all its terms and conditions for copying,
      distributing or modifying the Program or works based on it.
 
   7. Each time you redistribute the Program (or any work based on the
      Program), the recipient automatically receives a license from the
      original licensor to copy, distribute or modify the Program
      subject to these terms and conditions.  You may not impose any
      further restrictions on the recipients' exercise of the rights
      granted herein.  You are not responsible for enforcing compliance
      by third parties to this License.
 
   8. If, as a consequence of a court judgment or allegation of patent
      infringement or for any other reason (not limited to patent
      issues), conditions are imposed on you (whether by court order,
      agreement or otherwise) that contradict the conditions of this
      License, they do not excuse you from the conditions of this
      License.  If you cannot distribute so as to satisfy simultaneously
      your obligations under this License and any other pertinent
      obligations, then as a consequence you may not distribute the
      Program at all.  For example, if a patent license would not permit
      royalty-free redistribution of the Program by all those who
      receive copies directly or indirectly through you, then the only
      way you could satisfy both it and this License would be to refrain
      entirely from distribution of the Program.
 
      If any portion of this section is held invalid or unenforceable
      under any particular circumstance, the balance of the section is
      intended to apply and the section as a whole is intended to apply
      in other circumstances.
 
      It is not the purpose of this section to induce you to infringe any
      patents or other property right claims or to contest validity of
      any such claims; this section has the sole purpose of protecting
      the integrity of the free software distribution system, which is
      implemented by public license practices.  Many people have made
      generous contributions to the wide range of software distributed
      through that system in reliance on consistent application of that
      system; it is up to the author/donor to decide if he or she is
      willing to distribute software through any other system and a
      licensee cannot impose that choice.
 
      This section is intended to make thoroughly clear what is believed
      to be a consequence of the rest of this License.
 
   9. If the distribution and/or use of the Program is restricted in
      certain countries either by patents or by copyrighted interfaces,
      the original copyright holder who places the Program under this
      License may add an explicit geographical distribution limitation
      excluding those countries, so that distribution is permitted only
      in or among countries not thus excluded.  In such case, this
      License incorporates the limitation as if written in the body of
      this License.
 
  10. The Free Software Foundation may publish revised and/or new
      versions of the General Public License from time to time.  Such
      new versions will be similar in spirit to the present version, but
      may differ in detail to address new problems or concerns.
 
      Each version is given a distinguishing version number.  If the
      Program specifies a version number of this License which applies
      to it and "any later version", you have the option of following
      the terms and conditions either of that version or of any later
      version published by the Free Software Foundation.  If the Program
      does not specify a version number of this License, you may choose
      any version ever published by the Free Software Foundation.
 
  11. If you wish to incorporate parts of the Program into other free
      programs whose distribution conditions are different, write to the
      author to ask for permission.  For software which is copyrighted
      by the Free Software Foundation, write to the Free Software
      Foundation; we sometimes make exceptions for this.  Our decision
      will be guided by the two goals of preserving the free status of
      all derivatives of our free software and of promoting the sharing
      and reuse of software generally.
 
                                 NO WARRANTY
 
  12. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO
      WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE
      LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
      HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT
      WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT
      NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
      FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS TO THE
      QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
      PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY
      SERVICING, REPAIR OR CORRECTION.
 
  13. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
      WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY
      MODIFY AND/OR REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE
      LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL,
      INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR
      INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
      DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU
      OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY
      OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN
      ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 
                       END OF TERMS AND CONDITIONS
 
 How to Apply These Terms to Your New Programs
 =============================================
 
 If you develop a new program, and you want it to be of the greatest
 possible use to the public, the best way to achieve this is to make it
 free software which everyone can redistribute and change under these
 terms.
 
    To do so, attach the following notices to the program.  It is safest
 to attach them to the start of each source file to most effectively
 convey the exclusion of warranty; and each file should have at least
 the "copyright" line and a pointer to where the full notice is found.
 
      ONE LINE TO GIVE THE PROGRAM'S NAME AND AN IDEA OF WHAT IT DOES.
      Copyright (C) 19YY  NAME OF AUTHOR
      
      This program is free software; you can redistribute it and/or
      modify it under the terms of the GNU General Public License
      as published by the Free Software Foundation; either version 2
      of the License, or (at your option) any later version.
      
      This program is distributed in the hope that it will be useful,
      but WITHOUT ANY WARRANTY; without even the implied warranty of
      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      GNU General Public License for more details.
      
      You should have received a copy of the GNU General Public License along
      with this program; if not, write to the Free Software Foundation, Inc.,
      59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 
    Also add information on how to contact you by electronic and paper
 mail.
 
    If the program is interactive, make it output a short notice like
 this when it starts in an interactive mode:
 
      Gnomovision version 69, Copyright (C) 19YY NAME OF AUTHOR
      Gnomovision comes with ABSOLUTELY NO WARRANTY; for details
      type `show w'.  This is free software, and you are welcome
      to redistribute it under certain conditions; type `show c'
      for details.
 
    The hypothetical commands `show w' and `show c' should show the
 appropriate parts of the General Public License.  Of course, the
 commands you use may be called something other than `show w' and `show
 c'; they could even be mouse-clicks or menu items--whatever suits your
 program.
 
    You should also get your employer (if you work as a programmer) or
 your school, if any, to sign a "copyright disclaimer" for the program,
 if necessary.  Here is a sample; alter the names:
 
      Yoyodyne, Inc., hereby disclaims all copyright
      interest in the program `Gnomovision'
      (which makes passes at compilers) written
      by James Hacker.
      
      SIGNATURE OF TY COON, 1 April 1989
      Ty Coon, President of Vice
 
    This General Public License does not permit incorporating your
 program into proprietary programs.  If your program is a subroutine
 library, you may consider it more useful to permit linking proprietary
 applications with the library.  If this is what you want to do, use the
 GNU Library General Public License instead of this License.
 
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