iagno 3.8.3
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* Fix inevitable hangs (caused by slow play) when the board is about 3/4 full
* Fix hang when neither side can move (now properly game over)
* Fix New Game after computer vs. computer game causing the computers to go nuts
* Fix Undo after the human was forced to pass
* Fix hidden infobar if it's visible when a new message is displayed
* Don't improperly play piece flip sound at the beginning of each game
* Fix piece flip sound sometimes playing many times in a row (like one too-long sound)

Contributors: Michael Catanzaro, John Cheetham, Dave Paul