Merging branch 'j.1'  into 'main'.

See merge request !2516

* Added a Python script to determine the wheel name via ‍‍`setuptools‍` ‍and removed the dummy C-code which was used as a 'hint' to `pip` to consider the Python wheel as a _platform-dependent_ wheel (instead of a pure-Python wheel).

* Restored `MANIFEST.in` file which is seemingly needed by `pip` under Windows to include the binaries.

* Removed unneeded zshell scripts which were used for making the Python package under MacOS.

* Added `wheel` to Python dependencies.

Merging branch 'a.setWheelName'  into 'main'.

See merge request !2514

See <https://stackoverflow.com/a/14159430>

Merging branch 'a.fixRPATH2'  into 'main'.

See merge request !2508

The default version from the Debian has extra dependencies.

Merging branch 'j.1'  into 'main'.

See merge request !2513

This reverts commit 0fa3bbe5.

[j.1] std unix cmds w/o explicit '/usr/bin/' to make them more portable (docker has them in /bin/) ()

Merging branch 'j.1'  into 'main'.

See merge request !2512

Merging branch 'j.1'  into 'main'.

See merge request !2511

Merging branch 'j.1'  into 'main'.

See merge request !2510

Merging branch 'a.fixRPATH'  into 'main'.

See merge request !2505

See e.g. <https://gitlab.kitware.com/cmake/cmake/-/issues/25049>

Due to recent changes, the RPATH was incorrectly set to, e.g.,
`$$ORIGIN/../lib`, with an extra `$` -- the correct RPATH being `$ORIGIN/../lib`.

Merging branch 'j.4'  into 'main'.

See merge request !2506

Merging branch 'j.2'  into 'main'.

See merge request !2504