Fixing Pp.strbrk which was reversing words.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@16529 85f007b7-540e-0410-9357-904b9bb8a0f7
Fixing #3042

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@16530 85f007b7-540e-0410-9357-904b9bb8a0f7
Code cleaning in Matching.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@16531 85f007b7-540e-0410-9357-904b9bb8a0f7