osgGLUT::Window, standardising on the Window ones, and therefore removing
an unitialized variable that had been introduced. This caused a crash
under WindowsXP due to send invalid values to glutReshapeWindow.
Renamed the osg::VisualsSettings to osg::DisplaySettings, and
osgUtil::VisualsRequirementsVisitor to osgUtil::DisplayRequirementsVisitor.
Added support for OSG_SCREEN_HEIGHT into osg::DisplaySettings, and added
a DisplaySettings* to the constructors of osg::SceneView and osg::Camera.
that used it, all references to the Standard C++ stream classes use the
std::ostream etc convention, all references to "using namespace std" and
"using namespace std::ostream etc" have been removed.
