changes I made:
+ put a warning in the console if a nonexistant screen is requested
+ add getters for the aglcontext and pixelformat -- I need access to
them in my own code.
"
implementation of GraphicsWindow:
- usage of WindowData, you can specify an existing window to use via
osg::Traits
- implementation of setScreenResolution and setScreenRefreshRate
- implementation of setWindowDecoration when window is already created.
There seems to be a bug regarding multiple threads and closing windows,
see my other mail on osg-users.
"
