VoltTable and TableHelper-related improvements
1. Make VoltTable.toFormattedString() truncate with an elipsis for long columns.
2. Add a deep comparison method to TableHelper that compares tables by values.
3. Minor fix to load generating TableHelper code.
Feedback from jpiekos.
Merge pull request #408 from VoltDB/hugg-tabletweaks

VoltTable and TableHelper-related improvements