Math Symbols in plots under Darwin/Panther

I've just committed a new version of the quartz device to R-devel.
This seems to fix the problem with displaying math symbols in plots 
under Panther.

I can't not more test R under Jaguar (at least not these days). In case 
you have the opportunity to do that, please send me a report if it 
brokes everything under Jaguar (or eventually say "it's ok")
A couple of test as example(plotmath) and demo(plotmath) should suffice 
to see if things go smoothly.


stefano