HCSVLAB-459: Added metadata items for the "responsible person" tag in collection metadata
HCSVLAB-459: Added storage of data owner. Storing relationships atween
ActiveFedora Collection objects and ActiveRecord User objects necessitates
a certain amount of juggling - the AF stuff does it all through metadata
triples and it's not clear what the URI of an AR object would be. So, we
store the data_owner of a Collection as the e-mail address of the user
(which is unique in the system) in the private_data_owner field and provide
wrapper functions data_owner and data_owner= as a neater external interface.
Bleargh.
HCSVLAB-459: Sorted out the relationship with Collections
HCSVLAB-459: Added the default data owneres as a config item
HCSVLAB-459: Set up the data owner of a collection on ingest
HCSVLAB-459: Clean up collections when we do a clear out