Merge branch 'feature/force-installation-of-python-modules' into 'master'

Martin Nolterequested to merge
cherry-pick-bcafed0b into releases/2.6

[cmake][python] use pip --upgrade on install

Closes #81 (closed)

See merge request !422 (merged)

(cherry picked from commit bcafed0b)

a127f6d0 [cmake][python] use pip --upgrade on install

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