last commit before tagging 4.01.0

git-svn-id: http://caml.inria.fr/svn/ocaml/version/4.01@14094 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
increment version number after tagging 4.01.0

git-svn-id: http://caml.inria.fr/svn/ocaml/version/4.01@14096 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
add back PR#6164, which was erased from Changes by mistake

git-svn-id: http://caml.inria.fr/svn/ocaml/version/4.01@14098 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02