Remove some `toggle-read-only' warnings.

* lisp/bs.el (bs-toggle-readonly): Call `toggle-read-only' interactively.

* lisp/descr-text.el (describe-char):
  lisp/progmodes/python.el (python-describe-symbol):
  Don't call `toggle-read-only', set `buffer-read-only'.
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.
Don't warn on toggle-read-only calls.

Clarify the documentation of toggle-read-only, and audit the code tree
for uses of toggle-read-only; where appropriate, switch to setting the
variable buffer-read-only or calling toggle-read-only with a (new)
second arg.

* lisp/files.el (toggle-read-only): Doc fix and code cleanup.  New arg
to allow printing the message when called from Lisp.

* lisp/emacs-lisp/bytecomp.el (byte-compile-interactive-only-functions):
Remove toggle-read-only.

* lisp/bindings.el (mode-line-toggle-read-only):
* lisp/dired.el (dired-toggle-read-only):
* lisp/ibuffer.el (ibuffer-do-toggle-read-only): Call toggle-read-only
with non-nil second arg.

* lisp/bs.el (bs-toggle-readonly):
* lisp/buff-menu.el (Buffer-menu-toggle-read-only): Remove
with-no-warnings around toggle-read-only.

* lisp/ffap.el (ffap--toggle-read-only): Accept a list of buffers.
Remove with-no-warnings around toggle-read-only.
(ffap-read-only, ffap-read-only-other-window)
(ffap-read-only-other-frame): Callers changed.

* lisp/help-mode.el: Don't require view package.
(help-mode-finish): Set buffer-read-only instead of calling
toggle-read-only.

* lisp/emacs-lisp/eieio-custom.el (eieio-customize-object):
* lisp/vc/ediff.el (ediff-set-read-only-in-buf-A): Set buffer-read-only
directly.

* lisp/gnus/smime.el (smime-certificate-info): Set buffer-read-only directly,
instead of calling toggle-read-only with a (bogus) argument.

* doc/emacs/buffers.texi (Misc Buffer): Document view-read-only.

* doc/lispref/buffers.texi (Read Only Buffers): Document toggle-read-only
changes.  Reword to account for the fact that read-only is currently not
supported in overlay properties.
* lisp/ibuffer.el (ibuffer-do-toggle-read-only):
* lisp/dired.el (dired-toggle-read-only):
* lisp/buff-menu.el (Buffer-menu-toggle-read-only):
* lisp/bindings.el (mode-line-toggle-read-only):
* lisp/bs.el (bs-toggle-readonly): Call toggle-read-only interactively.
Convert toggle-read-only calls to read-only-mode.

* bindings.el (mode-line-toggle-read-only):
* bs.el (bs-toggle-readonly):
* buff-menu.el (Buffer-menu-toggle-read-only):
* dired.el (dired-toggle-read-only):
* ibuffer.el (ibuffer-do-toggle-read-only): Use read-only-mode.
Update copyright notices for 2013.