Switch Includemod.Error, without trying to split the message (to keep current behavior).

git-svn-id: http://caml.inria.fr/svn/ocaml/branches/exception_registration@14117 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Switch {Translmod,Translcore,Translclass}.Error.

git-svn-id: http://caml.inria.fr/svn/ocaml/branches/exception_registration@14118 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Continue.

git-svn-id: http://caml.inria.fr/svn/ocaml/branches/exception_registration@14119 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Continue cleanup. driver/errors.ml is no longer needed.

git-svn-id: http://caml.inria.fr/svn/ocaml/branches/exception_registration@14120 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02