Use flake8
The first commits fixes that CI didn't run pep8 tests.
The second switches to flake8, because that's nicer to use and we don't have to care about pep8 vs pycodestyle and it allows inline comments to ignore warnings.
The first commits fixes that CI didn't run pep8 tests.
The second switches to flake8, because that's nicer to use and we don't have to care about pep8 vs pycodestyle and it allows inline comments to ignore warnings.