Rewrote osg:Statistics so that it is PrimitiveFunctor as is now completely

decoupled from osg::Drawable.  The Drawable::getStats() virtual method
no longer exists.

Updated the Viewer to use the osg::Statistics incarnation and reformated stats
to clean it up.

src/osg/Geometry.cpp

@@ -192,13 +192,6 @@ void Geometry::drawImmediateMode(State& state)
 
 }
 
-/** Statistics collection for each drawable- 26.09.01
- */
-bool Geometry::getStats(Statistics &)
-{
-    return false;
-}
-
 Drawable::AttributeBitMask Geometry::suppportsAttributeOperation() const
 {
     // we do support coords,normals,texcoords and colors so return true.