[feat] add some more or less uninformative expressions from academic genres to the base stoplist (bug-17)

[fix] myGraphs: basic testing of 'job finished' for first graph only (bug-42) TODO generalize for other graphs

[FIX] Bug Import. TODO: Import crawler should use same function as in constants (duplicata of code).

(importing the graph advances in my branch)

[FIX] project view progressbars (2/2): the check time intervals were returned from the wrong django view function

This reverts commit d9d93ae0, reversing
changes made to 4ef20306.

- Graphes asynchrones testés en mode prod
- Documentation, README amélioré
- cosmetics: aération du code (en particulier bridgeness...)
- factorisation et meilleur positionnement de la fonction compute_graph

 Modifications qui seront validées :
	modifié :         README.md
	modifié :         bridgeness.py
	modifié :         cooccurrences.py
	modifié :         graph.py