MBS-6571, load suffix in Data::Artwork->get_by_id and use that in Edit/Remove cover art edits.
MBS-6571, Use JOIN ... USING instead of NATURAL JOIN.
MBS-6571, load edited artwork in foreign_keys and move image filename from templates to entity class.
MBS-6630, do not show remove button on completed uploads.
MBS-6632, search result has "release-group" as type, but ExampleRelationshipsEditor expects "release_group".
Merge remote-tracking branch 'warp/mbs-6630' into beta
Merge remote-tracking branch 'warp/mbs-6632' into beta
Merge remote-tracking branch 'warp/mbs-6571' into beta

Conflicts:
	postgresql-musicbrainz-collate
	postgresql-musicbrainz-unaccent