Repository records - additional access points and facets.

Currently in 2.0, when browsing archival institutions there are facets for:
- archive type
- region (i.e. province in the Canadian context)

This enhancement would add two access points to the ISDIAH record:
- geographic subregion (e.g., Southwestern Saskatchewan, Northern Saskatchewan)
- thematic area (e.g., Agriculture, Local/regional history, Aboriginal peoples)

...and add facets to the repository browse:
- locality (city/community)
- geographic subregion
- thematic area

Default thematic areas are created for new installs and migrations.