Changes for new BPL, Digital Commonwealth sites; Geocoding fixes

- Resolve #7330: BPL spatial data, "United States" generic value
- Other geocoding improvements
- Fix #7488:  BPL dataProvider: add option to pull from
  recordInfo/recordContentSource
- Fix #7330 and #6097:  Created subject_and_spatial_transform_bpl to
  join spatial values on double-hyphen and add the coordinates
- Fix #7329: Iterify OAI-PMH/ListRecords/record, fix
  location_transform_bpl