(tex-mode-syntax-table): Add ^.

(tex-mode-syntax-table): Add ^.
(tex-font-lock-keywords-1, tex-font-lock-keywords-2):
Allow spaces around macro arguments.
(tex-mode-map): Inherit from text-mode-map, but rebind \t to
indent-for-tab-command.
(latex-mode-map, plain-tex-mode-map): New keymaps.
Inherit from tex-mode-map.
(tex-common-initialization): Don't setup the keymap any more
since it's now done right by define-derived-mode.
(latex-mode): Set skeleton-end-hook to nil.
(latex-skeleton-end-hook): Remove.
(tex-latex-block, latex-insert-item): Simplify.
(latex-syntax-after): Use following-char rather than char-after.
(tex-discount-args-cmds, tex-count-words): New functions.