🚀 go-pugleaf

I have added a first version of pondering to gnuchess. Right now it
just searches and fills the transposition table. The hash format of
the transposition table was changed to make it persistent. The code
uses a separate input thread, so you need to have support for POSIX
threads to compile this version. I would be particularly interested
whether this builds and runs on Windows (Cygwin or MSVC for the very
brave), as I have no Windows machine available for testing. Basic
testing has been done with Linux/PPC, compiler gcc 3.1, Solaris with
both gcc and the Sun compiler.

Further changes include:

- Fixed potential buffer overflow in src/pgn.c, which could be used
  to gain control of the user's machine if he feeds a malicious PGN
  file to gnuchess. (Thanks to David Wheeler for this one.)

- Removed all support for the Novag Universal Board. The recommended
  way of using it is via the Winboard extension linked to on
  http://www.tim-mann.org/extensions.html

- Revamped the commandline input code (should not be noticeable by
  users)

For more detailed changes please read the ChangeLog file and the
sources. The tarball is available under

http://people.debian.org/~lukas/gnuchess/

And please, please, this is barely tested ALPHA software, this is no
official release of gnuchess, so expect a bumpy ride. (The diff with
the current CVS head is ca. 120k at the moment.) If you have any
problems compiling or running it, or if it works just fine, I would
really like to hear it.

Lukas

P.S.: At the moment, disabling pondering is somewhat screwed, it will
 busy-wait for input, so it hogs the CPU in any case. I will address
 this problem soon.

-- 
Chess is a foolish expedient for making idle people believe they are
doing something very clever when they are only wasting their time.
  -- George Bernard Shaw