Adding more primitives to Exninfo

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@16214 85f007b7-540e-0410-9357-904b9bb8a0f7
Removing Exc_located and using the new exception enrichement
mechanism to retrieve the same information.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@16215 85f007b7-540e-0410-9357-904b9bb8a0f7