Style.

git-svn-id: http://caml.inria.fr/svn/ocaml/branches/extension_points@13533 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Get rid of the location argument on pci_params, and improve location of error messages.

git-svn-id: http://caml.inria.fr/svn/ocaml/branches/extension_points@13534 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Reorganize.

git-svn-id: http://caml.inria.fr/svn/ocaml/branches/extension_points@13535 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02