Composite keys and enumerations supported, and several ORHelper improvements.

• Composite keys supported, except in relations, thanks to Jerry Shea.
• Includes support for enumerated member types, also thanks to Jerry Shea.
• GetObjectCount was added, for getting record counts, thanks to Ken Muse.
• Bug Fix: An internal exception, which was being handled, is now prevented.
• ORHelper: Thanks to David D'Amico and Craig Tucker for both the following:
• ORHelper: Automatically handles one-to-many and many-to-one relations.
• ORHelper: Set default null-values based on type for nullable columns.