Merge branch 'release-v29.2' into develop
Changed NCDHC ("digitalnc") endpoint_url (#7552)
Added parsing of intermediateProvider, added MHL

- Added IAMapper.map_intermediate_provider(),
  Mapper.map_intermediate_provider(),
  ia_mapper.intermediate_providers dict.
- Added Medical History Library to Internet Archive collections.
- Added intermediateProvider report views
- Added intermediateProvider to schema for validation
Bumped version to 30.0
Merge branch 'release-v30.0'
Merge branch 'master' of https://github.com/dpla/ingestion