[New Version] v0.21b - Contempt factor and better interface support

Changes:

• Added support for 'infinite' search in uci (not applicable in winboard)
• Added support for fixed time per move search for both uci and winboard
• Added support for fixed depth search for both uci and winboard
• Added support for the '?' (winboard) and 'stop' (uci) move-now commands, the 'move now' command in certain interfaces now makes Mediocre move immediately
• Made null-moves only possible if the game is not in a pawn ending
• Introduced contempt factor to draw values (dependant on game phase)
• Added a game phase check that decides if the game is in the opening, middle game, ending or pawn ending
• Added final INFINITY variable instead of using 200000 in the code
• Cleaned up the line input, currently it can only set up a board with FEN and do perft/divide, might be enhanced again in later releases
• Increased the number of nodes before time or interrupt command are checked, hopefully this should take care of the bug where Mediocre stops searching

Note: I have commented out a few lines in the alpha-beta method that enables in-check extension. It should be working ok, but I want to do some further testing before releasing it.

mediocre_v0.21b