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Breaking changes:
- Remove atcontenttypes dependencies, migration, keep BaseClassMigratorForm.
[agitator] (620)
- Remove (ATCT) BBB view name registrations.
[agitator] (621)
Bug fixes:
- Adapt the tests to cope with the fact the since Plone 6 the Plone site root is cataloged [ale-rt] (616)
- Fixed typo in test 'constraints' -> 'constrains'. [iham] (619) (619)
- Use document_view as default for dx site root.
[agitator] (624)