Generic rights refactoring

arkindex/dataimport/api.py

arkindex/dataimport/tests/test_imports.py

arkindex/dataimport/tests/test_repos.py

arkindex/dataimport/tests/test_transkribus_import.py

arkindex/documents/admin.py

arkindex/documents/api/elements.py

arkindex/documents/api/entities.py

arkindex/documents/api/ml.py

arkindex/documents/fixtures/data.json

arkindex/documents/management/commands/build_fixtures.py

arkindex/documents/managers.py

arkindex/documents/models.py

arkindex/documents/serializers/elements.py

arkindex/documents/tasks.py

arkindex/documents/tests/test_bulk_classification.py

arkindex/documents/tests/test_bulk_elements.py

arkindex/documents/tests/test_bulk_transcriptions.py

arkindex/documents/tests/test_corpus.py

arkindex/documents/tests/test_corpus_authorized_users.py

arkindex/documents/tests/test_create_elements.py