Changed the NodeVisitor::apply(Drawable&) to call apply(Node&)


git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/trunk@14424 16af8721-9629-0410-8352-f15c8da7e697
Changed the osgUI behaviour so that events are set to be handled by Widgets that have focus even if they don't directly use them.  


git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/trunk@14425 16af8721-9629-0410-8352-f15c8da7e697