Fix a bug affecting parallelogram boards. #17
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When changing the board size from n x m to n x k, some of the internal board representations are not updated correctly, resulting in a bug. To reproduce:
boardsize 4 4
boardsize 4 2
play black a1
play black a2
play white b2
play white c2
showboard
dfpn-solve-state black
The answer is "white" although the position is clearly winning for Black. This pull request fixes the bug.