Quelques améliorations
Merge remote-tracking branch 'origin/master'

Conflicts:
	app/models/objects/Category.java
	app/models/objects/Referentiel.java
	app/models/objects/SessionStatus.java
	app/models/objects/access/CategoryDB.java
	app/models/objects/access/JCertifObjectDB.java
	app/models/objects/access/SessionStatusDB.java