I don't want to put it in the release branch, since I don't think the
tex-validate-* functions are very important, and the sexp motion
commands seem to be used quite a bit in tex-mode.
2007-09-07.
http://lists.gnu.org/archive/html/emacs-devel/2007-09/msg00874.html
-** tex-validate-region reports false errors on some LaTeX commands
-http://lists.gnu.org/archive/html/bug-gnu-emacs/2007-09/msg00038.html
-
** emacs-22.1 with GTK problems (with patches)
http://lists.gnu.org/archive/html/bug-gnu-emacs/2007-09/msg00055.html