Distinguish between numbered and unnumbered sections.
*** empty log message ***
Fix syntactic fontification.

* style/shortvrb.el (LaTeX-shortvrb-chars): Move from
tex-style.el.  Set default value to nil because just loading
shortvrb does not make | a shortvrb char.  One needs to define it
using \MakeShortVrb{\|}.  Extend the docstring so that it tells
that one should usually set this variable only buffer-locally.

* font-latex.el (font-latex-add-to-syntax-alist): Call
`font-latex-setup' to make syntactic font-lock changes effective.
Declare LaTeX-shortvrb-chars as safe local variable.

(LaTeX-shortvrb-chars): Declare it as safe local variable.
Add a ^L so that the file local variable example isn't picked up.
Use default parameter of completing-read.

* latex.el (LaTeX-environment): Use default parameter of
`completing-read'.
Use default parameter of `completing-read'.

* tex-buf.el (TeX-command-query): Use default parameter of
`completing-read'.

* tex.el (TeX-insert-macro): Use default parameter of
`completing-read'.

* latex.el (LaTeX-environment, TeX-arg-document): Use default
parameter of `completing-read'.