Fixed bugs in ChessBoard and added some tests.

Fixed the FEN-Gen-Code.
Fixed the FEN-Suffix-Code.
Fixed indices in getFigureAt(String)
Added initialization code for chess field.
Added lots of constants. Need some meaningful commentation on that.
Started with movement code for chessboard...

Added support for generic key-value meta data in chess games.
Changed location to site, as in PGNs.

Added Testcases for FEN.

Added default #toString()-methods. (for debugging etc.)
[Some need to be changed later if some members are added.]