Update documentation authored by Rémy Mozul's avatar Rémy Mozul
Documentation is provided in the *docs* folder.
Otherwise it is available [here](http://www.lmgc.univ-montp2.fr/~mozul/LMGC90_USER/UserDoc/docs_2020.rc1/index.html)
Otherwise it is available [here](http://www.lmgc.univ-montp2.fr/~mozul/LMGC90_USER/UserDoc/docs_2020/index.html)
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