Merge branch 'f-filesystem-core' into f-filesystem-directory

.docker/Dockerfile

.gitlab-ci.yml

.gitlab/issue_templates/Default.md

.gitlab/merge_request_templates/Default.md

CHANGELOG.md

CITATION.cff

README.md

tests/test_affiliation.py

tests/test_authentication.py

tests/test_boolean.py

tests/test_datatype.py

tests/test_datatype_inheritance.py

tests/test_datetime.py

tests/test_double.py

tests/test_empty_text_value.py

tests/test_error_stuff.py

tests/test_file.py

tests/test_importance.py

tests/test_inheritance.py

tests/test_issues_pylib.py