revbump.py sanity checking

1) Wow, revbump.py is awesome compared to how it used to be.  Run, read
cvs diff `cat commitlist`, cvs commit `cat commitlist`.  Much simpler
than before.

2) Trying to be careful to avoid committing stray uncommitted changes as
part lang/ocaml massive revbump, I found this regexp-exam-question
command useful:

  $ egrep '^[\+\-][^\+\-]' DIFF.revbump | awk '{print $1}'|sort |uniq -c
     1 +BUILDLINK_ABI_DEPENDS.camlp5+=
     1 +BUILDLINK_ABI_DEPENDS.ocaml-cmdliner?=
     1 +BUILDLINK_ABI_DEPENDS.ocaml-cryptokit?=
     1 +BUILDLINK_ABI_DEPENDS.ocaml-dbm?=
     1 +BUILDLINK_ABI_DEPENDS.ocaml-graphics?=
     1 +BUILDLINK_ABI_DEPENDS.ocaml-ipaddr?=
     1 +BUILDLINK_ABI_DEPENDS.ocaml-lwt_ssl?=
     1 +BUILDLINK_ABI_DEPENDS.ocaml-oasis?=
     1 +BUILDLINK_ABI_DEPENDS.ocaml-ssl+=
   209 +PKGREVISION=
     1 -BUILDLINK_ABI_DEPENDS.camlp5+=
     1 -BUILDLINK_ABI_DEPENDS.ocaml-cmdliner?=
     1 -BUILDLINK_ABI_DEPENDS.ocaml-cryptokit?=
     1 -BUILDLINK_ABI_DEPENDS.ocaml-dbm?=
     1 -BUILDLINK_ABI_DEPENDS.ocaml-graphics?=
     1 -BUILDLINK_ABI_DEPENDS.ocaml-ipaddr?=
     1 -BUILDLINK_ABI_DEPENDS.ocaml-lwt_ssl?=
     1 -BUILDLINK_ABI_DEPENDS.ocaml-oasis?=
     1 -BUILDLINK_ABI_DEPENDS.ocaml-ssl+=
    75 -PKGREVISION=