Move single table selection into sqldialect

SQL generation should be limited to the SQLDialect and not polluting
other areas of the codebase.
Restore column definitions to DataTable
Implement changes necessary for filtering rows and column slices
Removed SqlTransform as a specific entity
Fix formatting
Remove implicit for fixeddimensiontransformtable since this is no longer an entity
Remove support for fixed dimension transforms from the "From" DSL
Removing TransformableDataTable
Make Copy use a standard DataTable
Remove converstion to DataTable because it is no longer necessary
Implement new backend method for single table selection
Add an explicit call in the store to get a table by name
Add test for sqlTransform