HHH-7797 Block "unique" syntax on a column if a constraint can/will be
used
HHH-7797 UniqueDelegate & DefaultUniqueDelegate
HHH-7797 Finished first take on UniqueDelegate and rolled into .cfg and
.mapping
HHH-7797 Initial attempt at using UniqueDelegate within metamodel
HHH-7797 initial test case
HHH-7797 Finished auditing dialects.  Cleanup and javadocs.  Completed
uniqueness test.
HHH-7797 minor refactoring
test asserting Hibernate handling of unclear jpa behavior wrt merging detached object with reference to transient object via non-cascaded association
HHH-7797 Use unique indexes on nullable columns for DB2.  Correctly
handle @UniqueConstraint table annotations on second passes.
HHH-7797 Corrected failing test that was exposed by src changes
HHH-7871 Write cache should not using LOCAL flag

* Flags were not being applied in clustered environments because of
the use of classloader aware cache which was not forwarding them.
HHH-7872 - Improved L2 cache storage of "reference" data
HHH-7872 - Improved L2 cache storage of "reference" data
HHH-7797 Simplified UniqueKey creation and corrected a couple of
@UniqueConstraint bugs.
HHH-7872 corrected compiling issue
HHH-6627 HHH-7752 - Test cases
simple improvement and code format
refactor, remove redundant type cast
HHH-7561 - Fix and test
using ConcurrentHashMap for decrease synchronization