installation: moved from `setup.py` to `pyproject.toml`: - updated installation to use the now standard `pyproject.toml` instead of legacy `setup.py`. `setup.py` and other legacy files have been deleted. - removed outdated README4PACKAGERS - removed pylintrc which has not been correctly reviewed. Linter conf should go to `pyproject.toml` now. - [hatch](https://hatch.pypa.io) is now used as main building tool. However, thanks to the use of standards, other tools can be used too. - update .hgignore - several dependencies version bump, with code update to adapt to changes.

Those files are used for testing, and use big compression level on purpose.

They are personal work from Jérôme Poisson and can be re-used under the licence  CC By-SA 4.0
Note that this licence only apply to this dir and its subdirectories.

This work is licensed under the Creative Commons Attribution-ShareAlike 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by-sa/4.0/ or send a letter to Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.