Fixed the loopdiagram stuff #151

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jmarrec wants to merge 3 commits intosantoshphilip:masterfrom

Commits on Jan 30, 2017

Fixed the loopdiagram stuff (ex_loopdiagram.py now in /useful_scripts/loopdiagram). And added a séparation between makeplantloop and makeairloop.
jmarrec
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Commits on Aug 13, 2017