Document new DbConnection methods
Add DbConnection method to retrieve generated keys.
Add failing generatedKey test to Sqlite
Fix identity column tests: read may not be in order
Fix test directory structure
Fix copy/paste error in method name
Add TODO note
Replace sqlite's insert with a simpler implementation
Quote table names throughout in sqlite
Implement insertAndRetrieveGeneratedKeys; fix test
Return only single integer generated key
Implement insertAndRetrieveGeneratedKey for DB2
Extract common functionality in DB2 insert operations