[tex4ht] [bug #276] avoid multiple runs of latex

[Michal Hoftich]

> I'm wondering whether, rather than deciding in advance how many latex runs are
> needed, it would be sufficient simply for each latex run to search the latex
> log file for
> ' Rerun to get '
> 

Doesn't that support only LaTeX cross-references? We need additional
runs to get tex4ht links correctly. I was also thinking about running
bibtex/makeindex etc. only when needed. 

Michal