Exporting  count_printing_arguments_of_format and add_int_index.

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13605 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Complete rewriting of Format.mk_printf. Convergence between Printf and Format codes.

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13606 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02