                   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 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

  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 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.

  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 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.

  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 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.

  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 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.

  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 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.

  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 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.

  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