Add validation constraint + popup after edit + fix EcoreUtil.copy
fix empty folder
close input stream
Merge remote-tracking branch 'origin/master' into BS-2861
Merge remote-tracking branch 'origin/MasterBugFixing' into BS-2861
fix classpath
fix classpath
fix classpath
Merge remote-tracking branch 'origin/MasterBugFixing' into BS-2861

Conflicts:
	bundles/plugins/org.bonitasoft.studio.diagram/.classpath
BS-2861
Fix validation rules :
distinct removed inputs from new mandatory inputs.
Fix messages.