Ref: http://lists.gnu.org/archive/html/emacs-devel/2014-05/msg00502.html

* lisp/emulation/crisp.el, lisp/emulation/tpu-edt.el:
* lisp/emulation/tpu-extras.el, lisp/emulation/tpu-mapper.el:
* lisp/emulation/vi.el, lisp/emulation/vip.el, lisp/emulation/ws-mode.el:
Move to obsolete/.

* doc/emacs/ack.texi (Acknowledgments): Remove some obsolete items.

* doc/emacs/misc.texi (Emulation): Remove section.

* doc/lispintro/emacs-lisp-intro.texi (Autoload): Update loaddefs.el details.

* doc/misc/efaq.texi (Finding a package with particular functionality):
Update example.

* doc/misc/vip.texi: Mention this is obsolete.

* etc/NEWS: Mention this.

* dframe.el (dframe-timer-fn):
* files.el (dir-locals-read-from-file):
* mpc.el (mpc--status-timer-run, mpc--status-idle-timer-run, mpc-format):
* reveal.el (reveal-post-command):
* saveplace.el (load-save-place-alist-from-file):
* shell.el (shell-resync-dirs):
* w32-common-fns.el (x-get-selection-value):
* emacs-lisp/copyright.el (copyright-find-copyright):
* emacs-lisp/eldoc.el (eldoc-print-current-symbol-info):
* emulation/tpu-edt.el (tpu-copy-keyfile):
* play/bubbles.el (bubbles--mark-neighbourhood):
* progmodes/executable.el (executable-make-buffer-file-executable-if-script-p):
* term/pc-win.el (x-get-selection-value): Use with-demoted-errors.

* cus-start.el (show-trailing-whitespace): Move to editing basics.
* faces.el (trailing-whitespace): Don't use whitespace-faces group.
* obsolete/old-whitespace.el (whitespace-faces): Remove group.
(whitespace-highlight): Move to whitespace group.

* comint.el (comint-source):
* pcmpl-linux.el (pcmpl-linux):
* shell.el (shell-faces):
* eshell/esh-opt.el (eshell-opt):
* international/ccl.el (ccl): Remove empty custom groups.

* completion.el (dynamic-completion-mode):
* jit-lock.el (jit-lock-debug-mode):
* minibuffer.el (completion-in-region-mode):
* type-break.el (type-break-mode-line-message-mode)
(type-break-query-mode):
* emulation/tpu-edt.el (tpu-edt-mode):
* progmodes/subword.el (global-subword-mode, global-superword-mode):
* progmodes/vhdl-mode.el (vhdl-electric-mode, vhdl-stutter-mode):
* term/vt100.el (vt100-wide-mode): Specify explicit :group.

* term/xterm.el (xterm): Change parent group to terminals.

* master.el (master): Remove empty custom group.
(master-mode): Remove unused :group argument.
* textmodes/refill.el (refill): Remove empty custom group.
(refill-mode): Remove unused :group argument.

* textmodes/rst.el (rst-compile-toolsets): Use rst-compile group.

* cedet/semantic/symref/list.el (semantic-symref-auto-expand-results)
(semantic-symref-results-mode-hook)
(semantic-symref-results-summary-function): Fix :group.

* erc/erc-list.el (erc-list):
* erc/erc-menu.el (erc-menu):
* erc/erc-ring.el (erc-ring): Define custom groups, for define-erc-module.

* gnus/shr-color.el (shr-color-visible-luminance-min)
(shr-color-visible-distance-min): Use shr-color group.

* url/url-news.el (url-news): Remove empty custom group.

* bookmark.el (bookmark-bmenu-toggle-filenames): Doc fixes.
* comint.el (comint-prompt-read-only):
* custom.el (defcustom):
* hi-lock.el (hi-lock-mode):
* ibuffer.el (ibuffer-formats):
* ielm.el (ielm-prompt-read-only):
* novice.el (disable-command):
* saveplace.el (toggle-save-place):
* speedbar.el (speedbar-supported-extension-expressions):
* startup.el (auto-save-list-file-prefix, init-file-user)
(after-init-hook, inhibit-startup-echo-area-message):
* strokes.el (strokes-help):
* time-stamp.el (time-stamp):
* calendar/calendar.el (calendar, diary-file):
* calendar/diary-lib.el (diary-mail-entries, diary)
(diary-list-entries-hook):
* calendar/holidays.el (holidays, calendar-holidays):
* calendar/lunar.el (lunar-phases):
* calendar/solar.el (sunrise-sunset):
* emulation/edt.el (edt-load-keys):
* emulation/viper.el (viper-mode):
* eshell/em-alias.el (eshell-command-aliases-list):
* eshell/esh-util.el (eshell-convert-numeric-arguments):
* international/ogonek.el (ogonek-information):
* net/tramp-cmds.el (tramp-bug):
* net/quickurl.el (quickurl-reread-hook-postfix):
* play/decipher.el (decipher-font-lock-keywords):
* progmodes/cc-styles.el (c-set-style):
* progmodes/idlw-shell.el (idlwave-shell-prompt-pattern):
* progmodes/inf-lisp.el (inferior-lisp-prompt):
* progmodes/octave-mod.el (octave-mode):
* progmodes/sql.el (sql-mode, sql-interactive-mode, sql-password):
* progmodes/verilog-mode.el (verilog-read-defines):
* textmodes/two-column.el (2C-mode): Likewise.