Move Wikidata, CAS, Spellchecker and OEIS in a "Back-end" module.
Merge branch 'master' into restructuration

Conflicts:
	FinalReport/CAS.tex
Merge remote-tracking branch 'origin/master' into restructuration

Conflicts:
	FinalReport/wikidata.tex
Merge pull request #56 from ProjetPP/restructuration

Restructuration