Support loading id, gid and root_gid for attributes in remove relationship edits
Support saving id, gid and root_gid for attributes in remove relationship edits
Merge branch 'basic-entity-mbid-edits'

* basic-entity-mbid-edits:
  Also add MBIDs to basic Edit-type edits
  Add a basic entity_gid property to create-type edits and populate it with Edit::Role::Insert