Integrated various changes worked on at the Glasgow Science Center. Changes

include change the CameraManipulators so they work with double for time
instead of float.  Also added support for DataType to osg::StateAttribute
and StateSet so that they can be set to either STATIC or DYNAMIC, this
allows the optimizer to know whether that an attribute can be optimized
or not.

src/osgUtil/SceneView.cpp

@@ -66,15 +66,16 @@ void SceneView::setDefaults()
     _renderStage = new RenderStage;
 
 
-#ifndef __sgi
+//#ifndef __sgi
     // sgi's IR graphics has a problem with lighting and display lists, as it seems to store 
     // lighting state with the display list, and the display list visitor doesn't currently apply
     // state before creating display lists. So will disable the init visitor default, this won't
     // affect functionality since the display lists will be created as and when needed.
     DisplayListVisitor* dlv = new DisplayListVisitor();
     dlv->setState(_state.get());
+    dlv->setNodeMaskOverride(0xffffffff);
     _initVisitor = dlv;
-#endif
+//#endif
 
     _appVisitor = new AppVisitor;