Reduce use of (require 'cl).
* admin/bzrmerge.el: Use cl-lib.
* leim/quail/hangul.el: Don't require CL.
* leim/quail/ipa.el: Use cl-lib.
* vc/smerge-mode.el, vc/pcvs.el, vc/pcvs-util.el, vc/pcvs-info.el:
* vc/diff-mode.el, vc/cvs-status.el, uniquify.el, scroll-bar.el:
* register.el, progmodes/sh-script.el, net/gnutls.el, net/dbus.el:
* msb.el, mpc.el, minibuffer.el, international/ucs-normalize.el:
* international/quail.el, info-xref.el, imenu.el, image-mode.el:
* font-lock.el, filesets.el, edmacro.el, doc-view.el, bookmark.el:
* battery.el, avoid.el, abbrev.el: Use cl-lib.
* vc/pcvs-parse.el, vc/pcvs-defs.el, vc/log-view.el, vc/log-edit.el:
* vc/diff.el, simple.el, pcomplete.el, lpr.el, comint.el, loadhist.el:
* jit-lock.el, international/iso-ascii.el, info.el, frame.el, bs.el:
* emulation/crisp.el, electric.el, dired.el, cus-dep.el, composite.el:
* calculator.el, autorevert.el, apropos.el: Don't require CL.
* emacs-bytecomp.el (byte-recompile-directory, display-call-tree)
(byte-compile-unfold-bcf, byte-compile-check-variable):
* emacs-byte-opt.el (byte-compile-trueconstp)
(byte-compile-nilconstp):
* emacs-autoload.el (make-autoload): Use pcase.
* face-remap.el (text-scale-adjust): Simplify pcase patterns.
Allow use of vc-root-* commands in *vc-log* buffers.

* lisp/vc/log-edit.el (log-edit-vc-backend): New variable.
(log-edit): Doc fix.

* lisp/vc/log-view.el (log-view-vc-fileset, log-view-vc-backend): Doc fix.

* lisp/vc/vc-dispatcher.el (vc-log-edit): New args.  Use PARAMS
argument of log-edit to set up all local variables.
(vc-start-logentry): New optional arg specifying VC backend.

* lisp/vc/vc.el (vc-checkin): Use it.
(vc-deduce-fileset): Handle Log Edit buffers.
(vc-diff): Make first argument optional too.
* lisp/vc/log-view.el (log-view-diff): Use use-region-p.
(log-view-diff-changeset, log-view-minor-wrap): Likewise.
Update docstrings for last change.
Update copyright notices for 2013.