Notes:

The "OpenRowset" implementation is completely untested. As ADO doesn't call OpenRowset,
this won't affect too many people.

The exact same goes to "GetSchemas" implementation.

New to Version 1.0.0.17:
- Schema support. Only "TABLES" at this point.

New to Version 1.0.0.16:
- Greatly improve the error reporting
- Fix the "no error checking on IID_NULL" bug.
