Removing Gmap from Notations.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@16494 85f007b7-540e-0410-9357-904b9bb8a0f7
Removing unused module Nbtermdn.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@16495 85f007b7-540e-0410-9357-904b9bb8a0f7