Added Object::resizeGLObjectBuffers(uint) method to help improve the ability

to change the number of active graphics contexts on the fly during an applications
life.

include/osg/Geode

@@ -138,6 +138,9 @@ class OSG_EXPORT Geode : public Node
 
         virtual BoundingSphere computeBound() const;
 
+        /** Resize any per context GLObject buffers to specified size. */
+        virtual void resizeGLObjectBuffers(unsigned int maxSize);
+
         /** If State is non-zero, this function releases any associated OpenGL objects for
            * the specified graphics context. Otherwise, releases OpenGL objexts
            * for all graphics contexts. */