CSPACE-5845: First minor changes toward storing collectionspace_core:ref...

...Name values with imported records.

CSPACE-5845: Created initial (failing) test of refName value in collectionspace_core.

CSPACE-5845: Placeholder method added for inserting refName values into collectionspace_core on import.

CSPACE-5845: Plain old id-style refNames now generated by Imports service and added to collectionspace_core:refName.

CSPACE-5845: Added (as yet untested) code to insert a provided refName, if any, into collectionspace_core:refName, and to add a display name to the ID form of refNames if the relevant service supports hierarchy.

CSPACE-5845: Generation of display name for refNames for record types with hierarchy is now working, with its own unit test.

CSPACE-5845: Add null checks. Add tests for extracting refName value from an authority record and adding that value to collectionspace_core:refName.

CSPACE-5845: Remove currently-irrelevant comments.