Checkoutmanager

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- Nothing changed yet.

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- Fixed regex strings by making them 'raw' strings. A modern python would otherwise
complain (rightfully so) about invalid escape sequences (``\s``, ``\d``).

- Internal project change: ``.venv/`` instead of ``venv/``. And removed buildout config
as we've been using virtualenv via the makefile for a while now.

- Testing on python 3.9 and 3.13 now, instead of ye olde 3.8.

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- Fixed super() call on the MultiExecutor that I messed up when
modernizing the python 2.7 code :-)

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- Cleaned up left-over TODO comments in readme.

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- Added github action for basic testing.

- Removed ye olde buildout setup, including z3c.testsetup. Using
pytest now.

- Removed python 2.7 support, we're on 3.8+ now.

- Achieved compatibility with python 3.12:
Safeconfigparser->ConfigParser.

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- More robust error handling.
[mortenlj]