Bug 315231 - [All Diagrams] Direct Edit : Xtext / Papyrus integration
	Better support for editing of transitions
Bug 315231 - [All Diagrams] Direct Edit : Xtext / Papyrus integration,
	Fixed transition editor (merge problem from branch bugs/315231-xtext)
Bug 427025 - [OCL For Papyrus] Cannot create OCL constraints in Luna - return context element instead of first constrained element
315231: [All Diagrams] Direct Edit : Xtext / Papyrus integration
https://bugs.eclipse.org/bugs/show_bug.cgi?id=315231

- Fix releng
Synchronize with master
Bug 315231 - [All Diagrams] Direct Edit : Xtext / Papyrus integration
	Enable validation without showing a progress bar
	Avoid focus lost for editor in properties tab after control assist ends
	Simple undo/redo support for editor in progress tab
323802: [General] Papyrus shall provide a read only mode
https://bugs.eclipse.org/bugs/show_bug.cgi?id=323802

Fix the enablement of the "Enable Write" action in the Model Explorer, which is not enabled on elements in read-only workspace resources.
323802: [General] Papyrus shall provide a read only mode
https://bugs.eclipse.org/bugs/show_bug.cgi?id=323802

Make new Advanced Editing property section sensitive to read-only model elements.  Also update the validation infrastructure to account for the new UML2 plug-in structure in Luna (prerequisite for validation of Advanced Editing parsing).
Bug 315231 - [All Diagrams] Direct Edit : Xtext / Papyrus integration
	Xtext editor in property view: only commit, if editor contains changes