Add basic VC push support.
* lisp/vc/vc.el (vc-push): New autoloaded command. * lisp/vc/vc-hooks.el (vc-prefix-map, vc-menu-map): Add vc-push. * lisp/vc/vc-bzr.el (vc-bzr--pushpull): New, factored from vc-bzr-pull. (vc-bzr-pull): Reimplement using vc-bzr--pushpull. (vc-bzr-push): New. * lisp/vc/vc-git.el (vc-git--pushpull): New, factored from vc-git-pull. (vc-git-pull): Reimplement using vc-git--pushpull. (vc-git-push): New. * lisp/vc/vc-hg.el (vc-hg--pushpull): New, factored from vc-hg-pull. (vc-hg-pull, vc-hg-push): Reimplement using vc-hg--pushpull. * doc/emacs/maintaining.texi (Pulling / Pushing): Rename from "VC Pull". Mention pushing. (VC With A Merging VCS, VC Change Log): Update xrefs. (Branches): Update menu. * doc/emacs/emacs.texi: Update menu. * etc/NEWS: Mention this.
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