(latex-imenu-indent-string): Add a space.

(latex-imenu-indent-string): Add a space.
(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.