- add __table_cls__ option to declarative, not publicized yet, is for the moment

- add __table_cls__ option to declarative, not publicized yet, is for the moment
for the benefit of the test.lib.schema package.
- use test.lib.schema.Table for the table within test.lib.fixtures.DeclarativeMappedTest
- [bug] Removed the check for number of
rows affected when doing a multi-delete
against mapped objects.   If an ON DELETE
CASCADE exists between two rows, we can't
get an accurate rowcount from the DBAPI;
this particular count is not supported
on most DBAPIs in any case, MySQLdb
is the notable case where it is.
[ticket:2403]