GNU GENERAL PUBLIC LICENSE
                       Version 2, June 1991

 Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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 Lesser 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 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 to 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

  0. 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 other
   languages.  (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.

  1. 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 the GNU General Public 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.

  2. 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
   portion 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 in themselves, then this License, and
 its terms, do not apply to those sections when you distribute them
 separately.  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.

  3. 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 a "work based on the Program", the 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.

  4. 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.

  5. 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.

  6. 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 and 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.

  7. 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 upon 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 that system's consistent
   application of those practices.  The author/distributor is willing to operate
   that free software distribution system and a user can rely on it to produce
   consistent software provided the software is not encumbered by patents.

  8. 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.

  9. 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.

  10. 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

  11. 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.

  12. 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 license text is found.

   <one line to give the program's name and a brief idea of what it does.>
   Copyright (C) <year>  <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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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:

 `The programs 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 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 corresponding author>, 1 April 1989
  Ty Coon, President of Vice

This General Public License does not permit incorporating your program into
proprietary programs.  If your software 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 Lesser General
Public License instead of this License.