ENG-3154,ENG-3153,ENG-3163,ENG-4357: Support and prep code for schema change.
Also some typo fixes.
No functionality changes.
More smallish changes from the schema branch to the prep branch.
Merge remote-tracking branch 'origin/master' into ENG-3153-schemaprep
Fix table generation bug and add a better comment to a TableHelper method.
Cleanup of the schema-prep branch per pmartel feedback.
Merge remote-tracking branch 'origin/master' into ENG-3153-schemaprep
Merge pull request #386 from VoltDB/ENG-3153-schemaprep

Eng 3153 schemaprep