Merging branch 'main_clang_format'  into 'main'.

See merge request !1063

Merging branch 'i116'  into 'main'.

See merge request !1061

Merging branch 'fixQt6'  into 'main'.

The configuration of the Mac CI-machines were corrupted after some upgrade or installation of new packages. More precisely, `brew`-generated symlinks were incorrect.

Seemingly, `brew` produces/updates the symlinks after installation of new packages or upgrades. For our build system, where we need multiple versions of Python and Qt, this can lead to a state where `cmake` find-package mechanism is confounded; sometimes even after finding the right packages, errors appear late, during the build phase.

I upgraded the packages on Mac 10.15 and 12.10, and corrected the paths in GitLab-CI YAML file.

See merge request !1060

Merging branch 'covclean'  into 'main'.

See merge request !1059

Merging branch 'i335i'  into 'main'.

See merge request !1058

Merging branch 'i335h'  into 'main'.

See merge request !1057