Upstream changes:
* change the special case of bold italics to "-mixsecs" option.
o allow a special case of bold italics (used in captoinfo.1m in ncurses)
o provide a special case for ncurses's main manpage, which now uses
italics for the subsections defining environment variables, rather
than bold.
o convert remaining tabs to spaces (perl tidy already did most).
o reset variable used to splice links which are broken by hyphenation,
if the bold text happens to not match the see-also pattern. This
occurred with ncurses curs_refresh.3x.html file.
o fix a case where optional pattern in substitution did not match,
causing an uninitialized-variable warning.
2523a664b3