- Fully implemented the

- Fully implemented the
:paramref:`~.Operations.batch_alter_table.copy_from` parameter for
batch mode, which previously was not functioning.  This allows
"batch mode" to be usable in conjunction with ``--sql``.
fixes #289
- sqlite dialect checks for "create_index" and "drop_index" as exceptions
for "recreate" in batch mode, the same way as "add_column", so that
unnecessary table recreates don't emit for index-only operations