Remove never-used rev argument from VC's backend checkin methods.
Alters vc/vc-arch.el, vc/vc-bzr.el, vc/vc-cvs.el, vc/vc-dav.el, vc/vc-git.el, vc/vc-hg.el, vc/vc-mtn.el, vc/vc-rcs.el, vc/vc-sccs.el, vc/vc-svn.el, vc/vc.el. Only the RCS, SCCS, and CVS back ends tried to do anything with it, and that code was never exercised. Chiseling away the cruft of decades...
Showing with 74 additions and 57 deletions