file-name-nondirectory returns when given a directory name.
Explain that abbreviate-file-name works on file names too.
Explain how to combine a directory name with a relative file name
with concat, and the pitfalls.
Update some details.
(comint-inhibit-carriage-motion): New variable.
(comint-carriage-motion): Argument STRING removed. New arguments
START and END; interpret characters between START and END rather
than using special comint state.
(comint-output-filter): Call `comint-carriage-motion'.
(comint-output-filter-functions): Don't add `comint-carriage-motion'.
(reftex-syntax-table): Set a default in case this is being used
outside a LaTeX file.
(reftex-syntax-table-for-bib): Set a default in case this is being used
outside a LaTeX file.
(menu-bar-right-scroll-bar, menu-bar-left-scroll-bar)
(menu-bar-no-scroll-bar, menu-bar-toggle-auto-compression)
(menu-bar-toggle-cua-mode, menu-bar-read-mail)
(menu-bar-help-extra-packages, help-with-tutorial-spec-language)
(menu-bar-text-mode-auto-fill): New commands, used
in menu bar menus instead of lambda expressions.
(menu-bar-showhide-fringe-menu-customize-left)
(menu-bar-showhide-fringe-menu-customize-right)
(menu-bar-showhide-fringe-menu-customize-disable)
(menu-bar-showhide-fringe-menu-customize-reset): Doc fixes.
(menu-bar-options-menu): Use toggle-truncate-lines.
(showhide-date-time): Call customize-mark-as-set.
(help-split-fundoc): Tighten the regexp and recognize a usage-info
where the function name is `fn'.
(help-function-arglist): Follow aliases and macros.
(describe-function-1): Use keymapp.
If the docstring contains a usage info, use it even if the function is
not a subroutine. Find usage info in aliases' docstring if necessary.
(describe-variable): Get the value before setting up the *Help* buffer.
(define-minor-mode): Get rid of this silly `togglep'.
Add an explicit `toggle' argument (used for interactive calls).
Emit a warning when a nil argument turns the mode off.
