[16] use jupyter/minimal-notebook as base, drop python2.x support, up…#2

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finalspy wants to merge 3 commits intov2-appfrom

Commits on Jul 8, 2020

[16] use jupyter/minimal-notebook as base, drop python2.x support, update to latest saagie/python image in a separate folder
finalspy
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Commits on Jul 9, 2020