Tabify.

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13291 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Normalization.

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13292 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02