Rockbox

This is my port of GNUChess 2 to the RockBox, I think
it works on anything with an LCD bigger than 64×64 pixels. Apart from the two notes at the end I think it
is commitable.

Work:

* Tested on the uisim on Recorder, H120 , H320 & iPod
Color (not sure if the button asignements are sensible)
* Tested on iron on my H120
* Quite usable piece sets and button maps for all
available targets
* 8 levels, time based
* Play with white or black

Will work:

* Menus (I’m trying to commit before menus because I
ran out of buttons)
* Save and restore games
* Undo move
* Two side computer or human
* Opening book

Procastrination is for the weak:
* Think on your time
* PGN reader and analyling mode

Some notes:

Taking less than 64K of buffer for the trasposition table.
GNUChess “library” included the ugly way (#include
“gnuchess.c”) ¿any makefile wizard to fix this?