Add handling of error tag in OAI-PMH response
Fix setting of collections in fetcher and fix PTH identifier
ARTstro crosswalk fixes

- Unset sourceResource.relation for ARTstor
- Add geocoding to ARTstor
Fix Hathi and UIUC MARC mapping

- Replace isPartOf with relation
- Remove stateLocatedIn mapping
Fix NARA mapping

- Replace isPartOf with relation in NARA mapping
- Fixed mapping for identifier, rights, and collection description
Fix 6625

- Fix isPartOf mapping for IA
Merge branch 'release-v16.0'