- apparently [ticket:1761] was covered in tests already.

- apparently [ticket:1761] was covered in tests already.
- Usage of version_id_col on a backend that supports
cursor.rowcount for execute() but not executemany() now works
when a delete is issued (already worked for saves, since those
don't use executemany()). For a backend that doesn't support
cursor.rowcount at all, a warning is emitted the same
as with saves.  [ticket:1761]