Improved solving; should now solve all easy puzzles.
authorEevee <eevee@nyarumaa.(none)>
Wed, 7 Jan 2009 14:30:23 +0000 (09:30 -0500)
committerEevee <eevee@nyarumaa.(none)>
Wed, 7 Jan 2009 14:30:23 +0000 (09:30 -0500)
Grid.solve() now keeps trying its elimination methods until they stop
doing anything.
Also snuck in Constraint.is_linear, in preparation for solving by row/box
interaction.


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