Print attributes on types and patterns.

git-svn-id: http://caml.inria.fr/svn/ocaml/branches/extension_points@13598 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Continue to add support for attributes to Camlp4, a little bit.

git-svn-id: http://caml.inria.fr/svn/ocaml/branches/extension_points@13599 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02