EAD import: fix importing records with non-event ID tags

* Prefix atom_ to every event ID tag, to distinguish from non-AtoM tags
* Check suffix of the tag to make sure it's the correct event type,
  to avoid catching other kinds of ID tags

Fixes #7498.
Fix version setting value in fixtures
Add Finding Aid format setting, refs #7615

- Setting added at the bottom of the global form
- Added setting data in fixtures and migration script
- Formats available: PDF, RTF and TXT
Add PREMIS rules for viewing digital objects #7463

Fix style issues, make sure strings use I18n

Add more info to inherit rights job

Bump database version in fixtures

Add viewThumbnail permissions to migration

Bump version again, rename file