Marker class for constraint violations
New exception for concurrent violations
Violations on new definition fail DDL instead
MT reactions to new behavior
Flag for forcing foreign key checks to happen immediately
MT determinism tweaks
Persistit implementations
merge nathanlws: Violations from concurrent DML fail DDL instead

Merge pull request #1333 from nathanlws/sql-layer/dml-violation-fails-ddl
https://github.com/FoundationDB/sql-layer/pull/1333