Prefix bib 520 & 521 i1 properties and tokenMap values with marc
Prefix bib 520 & 521 i1 properties and tokenMap values with marc

We can't really use typeNote, as these values would have to remain
strings as RDF (as typeNote is a DatatypeProperty). With this change, we
can define these properties as type vocab in JSON-LD, and use dropdowns
for the values in the cataloguing interface.

libris/librisxl,libris/librisxl,libris/librisxl