General code improvements
Created originally on Bitbucket by paugier (Pierre Augier)
Was already merged in Bitbucket before import, marked as merged by the import user
We no longer support Python 2.7 (with fluiddyn) so we can clean the code.
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black
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Slightly better install (setup.cfg)
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pyupgrade --py36-plus
find -name "*.py" | xargs pyupgrade --py36-plus