Makes graphs working without GNUPLOT

Use internal capabilites instead (the graphs have a small number of
points, so the compilation time isn't affected)

Fix spelling and other details
Merge pull request #118 from cassiersg/chimie3

Makes graphs working without GNUPLOT
Small spelling correction
Merge pull request #119 from anpar/master

Small spelling correction (q1/math)
Add INMA2380 by Yannick Tivisse
Merge branch 'master' of https://github.com/Gp2mv3/Syntheses
eight -> eighth in biblio.bib (math-q2)
Add support for english
Merge pull request #121 from anpar/patch-1

eight -> eighth in biblio.bib (math-q2)
Add beginning - INMA2471 q7
Merge pull request #120 from jdewasseige/master

explication charge effective + détails pour créer une nouvelle synthèse
Merge branch 'master' of https://github.com/Gp2mv3/Syntheses
prevent VIM from hiding sections below footnote