pyproject.toml and pylint, flake8

[GernotMaier]

Noticed two issues related to linters:

Pylint:

• configuration is listed explicit with every parameter in pyproject.toml (generated with --generate-toml-config). These are over 500 lines, makes it hard to navigate, and difficult to find which parameters we changed. Suggest to only list the settings we change (will maybe in 20 lines), see PR Linter updates #684
• was there a reason not to use pylint as a action workflow? It is very pedantic and maybe it simply went on our nerves

Flake8

flake 8 configurations can be found in two places:

• pre-commit is running with args: ["--max-line-length=100", "--extend-ignore=E203,E712"]
• github action is running with ``--max-line-length 100 --per-file-ignores="_version.py:F401 E501" .`

[GernotMaier]

On the flake 8 warnings / errors ignores.

In .pre-commit - why do we ignore those two? I suggest to remove them, see PR #688

• Whitespace before ':' (E203)
• Comparison to true should be 'if cond is true:' or 'if cond:' (E712) (https://www.flake8rules.com/rules/E712.html)

In CI-unittests:

Here we actually ignore only for version.py some warnings, so we should keep this.