Bulk delete image doesn't decrement EntityCounters

[donaldgray]

When deleting a single images EntityCounter(s) are decremented and related records are deleted too (ImageStorage/ImageLocation etc) but this isn't happening for bulk deletes.

[donaldgray]

Note - this may best resolved by having the cleanup handler remove storage + location records. Delete handler would need to decrement EC counter, although recalculator logic would tidy up.

A better option would be to enforce referential integrity and use cascade delete on child records, although orphans would need to be cleaned up first.