[BioC] Rgraphviz for Windows

[Jeff Gentry]

> I tried to use GOstats package, and realized that
> Rgraphviz package is required for displaying the graph
> that I created  (is this true?).  Then I found out
> that the Rgraphviz package for Windows is not
> available.  Any work-around for this?  Thanks a lot
> for your help.

Well, for the short term, the main workaround is to not use Windows.  We
are looking at trying to get a Rgraphviz build for Windows in the not too
distant future, though.