Revert "Merge branch 'feature/remove-venv-dune-common-dependency' into 'master'"

This reverts merge request !1162 (merged)

assigned to @andreas.dedner

The nightly tests work but the ubuntu 18 image triggered by the dune-common CI fails. Have not yet investigated further.

enabled an automatic merge when the pipeline for 461b07d2 succeeds

canceled the automatic merge

mentioned in commit c6c89148

merged

resolved all threads

mentioned in issue #313