LDEV-3491: Deleting a learning design no longer removes it from the database. Now it flags removed = true. Calls to get the learning designs in the DAO layer ignore rows where removed = true. Cleaned up some methods in the DAO layer that are no longer used.
LDEV-3491: Deleting a learning design no longer removes it from the database. Accidently removed one too many methods from the interface - putting it back.