GitLab

* Result of black 23.1

* Update target to Python 3.7

* Switch flake8 to ruff

* Configure isort

* Configure isort

* Apply isort with line limit

* Put the right black version

* adapt black in check copies

* Fix copies

* More tests for regression in cached non existence

* Style

* Fix cached_file in offline mode for cached non-existing files

* Add tests

* Test with offline mode