ChangeLog is no longer a subclass of ArrayList.
Several interfaces simplifications: unusable fields removal, use of interfaces instead of concrete classes, comments.
Conflict resolution

Conflicts:
	fr.inria.atlanmod.neo4emf/src/main/java/fr/inria/atlanmod/neo4emf/change/IChangeLog.java
	fr.inria.atlanmod.neo4emf/src/main/java/fr/inria/atlanmod/neo4emf/change/impl/ChangeLog.java
	fr.inria.atlanmod.neo4emf/src/main/java/fr/inria/atlanmod/neo4emf/drivers/IPersistenceService.java
	fr.inria.atlanmod.neo4emf/src/main/java/fr/inria/atlanmod/neo4emf/drivers/impl/PersistenceService.java
ChangeLog new constructor.