[R-gui] Cairo graphics device for Windows and RGtk2 2.8.2 released

Dear all,

I have managed to build the Cairo R graphics device for Windows. This 
lets you embed R graphics in RGtk2 interfaces on Windows.

I have also uploaded a minor bugfix release of RGtk2.
Changes:
- New demo showing integration with Cairo graphics device
- Some demo fixes, bugs reported by Bill Morphet.
- Fixed an RGtkDataFrame bug reported by John Verzani.

Please download new versions at http://www.ggobi.org/rgtk2

Thanks,
Michael Lawrence