Remove some functions, variables and aliases obsolete since at least 21.1.

Remove some functions, variables and aliases obsolete since at least 21.1.

* doc/misc/misc.texi (Shell Mode): Remove reference to old function name.

* src/character.c (Fchar_bytes): Remove obsolete function.
(syms_of_character): Remove Schar_bytes.
* lisp/subr.el (char-bytes): Remove obsolete function.

* lisp/emacs-lisp/checkdoc.el (checkdoc-minor-keymap): Remove obsolete alias.

* lisp/isearch.el (isearch-return-char): Remove obsolete function.

* lisp/mouse.el: No longer provide mldrag.
(mldrag-drag-mode-line, mldrag-drag-vertical-line):
Remove obsolete aliases.

* lisp/comint.el (comint-kill-output): Remove obsolete alias.

* lisp/shell.el: Comment fix.

* lisp/composite.el (decompose-composite-char): Remove obsolete function.
* lisp/ps-def.el (decompose-composite-char): Remove unused function.

* lisp/iswitchb.el (iswitchb-default-keybindings): Remove obsolete function.

* lisp/outline.el (outline-visible): Remove obsolete function.

* lisp/term/pc-win.el (x-frob-font-slant, x-frob-font-weight):
* lisp/faces.el (internal-find-face, internal-get-face)
(frame-update-faces, frame-update-face-colors)
(x-frob-font-weight, x-frob-font-slant)
(internal-frob-font-weight, internal-frob-font-slant)
(x-make-font-bold, x-make-font-demibold, x-make-font-unbold)
(x-make-font-italic, x-make-font-oblique, x-make-font-unitalic)
(x-make-font-bold-italic): Remove functions and aliases, obsolete
since Emacs 21.1.
* lisp/emulation/viper-util.el (viper-get-face):
* lisp/obsolete/lucid.el (find-face, get-face): Use facep.
* lisp/vc/ediff-init.el (ediff-valid-color-p, ediff-get-face):
Remove unused functions.
* lisp/vc/ediff-util.el (ediff-submit-report): Doc fix.

* etc/NEWS: Mention above changes.