(latex-standard-block-names): Rename from standard-latex-block-names.

(latex-standard-block-names): Rename from standard-latex-block-names.
(tex-font-lock-keywords-1): Add providecommand, renewenvironment, and
renewtheorem.  Highlight \it and \bf separately since they may overlap.
(tex-font-lock-suscript, tex-font-lock-unfontify-region): New funs.
(tex-font-lock-keywords-3, tex-verbatim-environments)
(tex-font-lock-syntactic-keywords): New vars.
(superscript, subscript, tex-verbatim-face): New faces.
(tex-font-lock-syntactic-face-function): Handle \verb construct.
(tex-common-initialization): Update font-lock-defaults setting.
(tex-insert-braces): Make it into a skeleton.
(latex-fill-nobreak-predicate): Don't break after \.
(latex-insert-block): Rename from tex-latex-block.
(latex-down-list): Use tex-mode-syntax-table when skipping parens
rather than the indentation syntax-table.
(latex-close-block): Rename from tex-close-latex-block.
(latex-split-block): New fun.
(latex-indent): Don't indent inside a verbatim block.
(latex-find-indent): Stick \begin{verbatim} to the margin.