Consider moving some BFLC properties and classes to the "regular" BF ontology.

• bflc:CaptureStorage (https://id.loc.gov/ontologies/bflc.html#c_CaptureStorage)
  requested by sound recording catalogers at LC, based on MARC 007/13

• bflc:relief/bflc:Relief (https://id.loc.gov/ontologies/bflc.html#p_relief and https://id.loc.gov/ontologies/bflc.html#c_Relief)
  requested by map catalogers at LC, based on MARC 008/18-21