Make user scopes into boolean attributes on users

arkindex/documents/fixtures/data.json

arkindex/images/api.py

arkindex/images/tests/test_image_api.py

arkindex/process/api.py

arkindex/process/tests/test_create_s3_import.py

arkindex/process/tests/test_list_buckets.py

arkindex/project/permissions.py

arkindex/sql_validation/process_elements_filter_ml_class.sql

arkindex/sql_validation/process_elements_filter_type.sql

arkindex/sql_validation/process_elements_top_level.sql

arkindex/sql_validation/process_elements_with_image.sql

arkindex/users/admin.py

arkindex/users/migrations/0001_initial.py

arkindex/users/migrations/0004_user_scopes.py

arkindex/users/models.py

arkindex/users/serializers.py

arkindex/users/tests/test_registration.py