(image-file-name-regexps): Renamed from `image-file-regexps'.
New default value is nil. Call `auto-image-file-mode'.
(image-file-name-regexp): New function.
(auto-image-file-mode): New minor mode.
(insert-image-file): Don't make conditional on the image-file
handler being enabled.
(image-file-handler): Make the call here conditional instead.
(set-image-file-handler-enabled, enable-image-file-handler)
(disable-image-file-handler): Functions removed.
(partial-completion-mode): Use define-minor-mode.
(PC-do-completion): Understand `completion-auto-help = delay'
to mean to popup the completion buffer only the second time.
(PC-include-file-all-completions, PC-include-file-all-completions)
(PC-include-file-all-completions): Don't quote lambda.
(comint-mode): Use define-derived-mode.
(comint-mode-map): Remove obsolete comment.
(make-comint): Minor stylistic change.
(comint-insert-clicked-input): Be more careful to find the overlay.
Use this-command-keys rather than hardcoding mouse-2.
(tex-font-lock-keywords-1, tex-font-lock-keywords-2):
Don't use regexp-opt-depth. Spice up the regexp for args.
Don't distinguish between cmds that can take an opt arg or not.
Use `append' and `prepend' rather than `keep'.
(latex-outline-regexp): New var.
(latex-outline-level): New fun.
(latex-section-alist): New var.
(latex-imenu-create-index): Use it. Use `push' as well.
(tex-shell-map): Initialize it properly.
(tex-mode): Minor stylistic change.
(plain-tex-mode): Use define-derived-mode.
(latex-mode): Use define-derived-mode.
Construct the paragraph regexps in a more readable way.
Set the buffer-local outline-{level,regexp} vars.
(slitex-mode): Derive from latex-mode.
(tex-common-initialization): Don't kill-all-vars anymore.
Add setting for comment-add and font-lock-defaults.
(tex-start-shell): Use with-current-buffer and don't re-init keymap.
(tex-main-file): New fun. Obey TeX-master as well and remove `.tex'.
(tex-start-tex): New arg DIR (and send a chdir command for it).
Also display the shell buffer and save it in tex-last-buffer-texed.
(tex-region): Use expand-file-name rather than concat.
Remove code made useless by changes in tex-start-tex.
(tex-file): Use tex-main-file and adapt to new tex-start-tex.
