Context: no refactoring in actor mapping when modifying an organization
Why: Initialy it was not part of the feature
Fix: Add a first implementation of rectoring based on an EMF Compare of
old and new organization. For now we support those use cases :
- user name updated
- role name updated
- group name updated

Conflicts:
	bundles/plugins/org.bonitasoft.studio.actors/META-INF/MANIFEST.MF
	bundles/plugins/org.bonitasoft.studio.actors/messages.properties
	bundles/plugins/org.bonitasoft.studio.actors/src/org/bonitasoft/studio/actors/i18n/Messages.java