Refactored all entity classes: added an interface for each entity, such that alternative data stores can swap out the entity objects with more fitting ones (eg with annotations like Neo4j, JPA, etc or other mechanisms. Internally, only the entity interface is used)

Refactoring the persistence: splitting of persistence specific code in the EntityManager classes into a DataManager class.
The EntityManager -> EntityManagerImpl  now each have a dedicated DataManagerImpl that contains all the MyBatis specific code,
effectively making it possible to plug that layer with some other implementation.

Note: Still need to check the usages of DbSqlSession in the behaviors/commands, but those should be easily portable too.

Making entity manager interfaces consistent: removing duplicate methods (findById/getEntity/..) and make sure they pass the entity cache

Refactoring entity manager usage: making the entity manager instances engine-scoped instead of a Session implementation (ie command scoped).
This way, all the previous Context.getXXX calls can be replaced by direct invocations. Won't influence performance that much, but still nicer from an architectural point of view.

Pulling PersistentObjectCache out of DbSqlSession, bringing it to the same level (a Session implementation).
Next stop is making the EntityManagers engine static (now they are session instantiated) and extracting an interface for the DbSqlSession.

Format back to 2 spaces for now, merging back from Activiti 5 is really an issue with spacing differences

(Activiti LDAP) Fix for http://forums.activiti.org/content/aciviti-513-ldap-integration : support for user and group base DN which are not the same