Basic program for comparing computer players
Merge branch 'master' into aitest
Merge branch 'master' into aitest
Merge branch 'aitest' of https://github.com/dpaul/iagno into aitest

Conflicts:
	src/aitest.vala
switch to bitboard representation
extract Board object
simplify undo history
comment out signals
Merge branch 'bitboard_nosignal' of https://github.com/dpaul/iagno into bitboard_nosignal