(texinfo-format-iftex, texinfo-format-ifhtml)

(texinfo-format-iftex, texinfo-format-ifhtml)
(texinfo-format-ifplaintext, texinfo-format-tex, texinfo-format-html)
(texinfo-format-ifnotinfo, texinfo-format-titlepage)
(texinfo-format-titlespec, texinfo-format-ignore, texinfo-if-set)
(texinfo-if-clear): Use re-search-forward's return value.
(texinfo-sort-startkeyfun, texinfo-format-buffer-1)
(texinfo-format-region): Use line-{end,beginning}-position.
(texinfo-append-refill, texinfo-alias): Use match-string-no-properties.