regenerated with xtend 2.6.0

Change-Id: Iba4965771a8baabdab5c039a2a6aa029cf339273
updated cspec and rmap for Xtext 2.6.0

Change-Id: Ifccc0674c824cc72a53785a53aec215f1acf063b
added minimum version range for eclipse.ui bundles

Change-Id: I95904121beab03526c2a01c9914bf69c7384d685