Revise unpackaged generator to include mark_editable_objects.sql.in

[robe]

The current unpackaged scripts don't include the mark_editable_objects.sql.in step. I realize in hindsight much to strk's digging that this needs to be included at the end.

The reason being is that that script marks what needs to be backed up that is part of the extension and without that for example, things like custom spatial_ref_sys and data in topology.topology, topology.layer will not be backed up.

This is most important for topology since it has records that are guaranteed to be changed.

This should be part of strk's new script. I'm not sure it makes sense to bother fixing the existing since its flawed because it's not including aggregates

[robe]

Milestone renamed

[strk]

Should this be merged with #1896 ?