RDBMS tests and init of the new module

The tests to check some Expressions to SQL statement conversion and started the new module which will provide a tool to generate the RDBMS module configuration by reverse engineering  
For `limit` and `offset` arguments I worry about quirks with auto-boxing because of checking for their values to be null.  I would have to read up on it again, but have definitely seen some hard to debug issues with auto-boxing and expecting a null value in this type of scenario.