[IMP] introduce collaboration feature#193

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EmilienD wants to merge 4 commits intomasterfrom

master-add-collaboration-edu

Commits on May 7, 2021

[REF] expand rollup configuration and scripts
Emilien Durieu (edu)
committed
[IMP] add venv to .gitignore
Emilien Durieu (edu)
committed
[FIX] no rollback when adding unremovable node
Emilien Durieu (edu)
committed

Commits on May 12, 2021

[IMP] add collaboration capabilities
Emilien Durieu (edu)
committed