Tree tent

[mmellone]

Finished modifications in tree tent according to what was discussed in 9/16 meeting.

• Changed CaseFillInRow to remove any cases with tents next to each other or with tents that overfill a row or column
• Renamed NoTentsForTree -> NoTentForTree and TentNotNearTree -> NoTreeForTent
• Split ContradictionMiscount into ContradictionTooFewTents and ContradictionTooManyTents