(texinfmt-version): New function and variable.
(texi2info): New function.
(texinfo-accent-commands): New variable.
(texinfo-no-refill-regexp): Use concat to make it clearer.
Add some more elements.
(texinfo-part-of-para-regexp): Likewise.
(texinfo-append-refill): Extend criterion 3 for when not to refill.
(texinfo-raisesections-alist): Add @centerchap.
(texinfo-lowersections-alist): Add @centerchap.
(texinfo-format-scan): Handle many more @-char commands.
(detailmenu): Add texinfo-format and texinfo-end properties,
(centerchap): Add texinfo-format property,
(texinfo-format-buffer): Doc fix.
(texinfo-parse-line-arg): Add doc string.
(texinfo-parse-arg-discard): Likewise.