Issue #88 - Provide pip to install dependencies of workbenches

[hfiguiere]

Closes #88

[flathubbot]

Started test build 106054

[flathubbot]

Build 106054 successful
To test this build, install it from the testing repository:

flatpak install --user https://dl.flathub.org/build-repo/103727/org.freecadweb.FreeCAD.flatpakref

[HakanSeven12]

Thanks 👍 I was looking for this. Can you also add the scipy module too? Its the part of the core libraries for other packages but not for flatpak.

[adrianinsaval]

what is scipy used for on FreeCAD? Is it installable through pip? If it's only for addon use IMO it makes more sense to declare as a dependency in your addon and the addon manager should take care of installing it when you install the addon (now that pip is included)

[hfiguiere]

also please file new issues for unrelated problems instead of piggybakcing on the merged PR that is even unrelated.