fetcht he correct id of change request
minor graph ehancement
Backend to forbid change request commit when current state diverged
Merge remote-tracking branch 'ncharles_origin/proto/workflows' into proto/workflows
Improve change request page UI
Merge remote-tracking branch 'vme_origin/proto/workflows' into proto/workflows

Conflicts:
	rudder-core/src/main/scala/com/normation/rudder/services/workflows/WorkflowService.scala