Added support for automatic creation of global StateAttributes to osg::State,

these global attributes are created by cloning any attributes which are
applied during rendering, the clone in a shallow copy, which will set up
default valus for that attribute.  This should prevent attribute bleed
from one stateset to the next when the global StateSet doesn't contain
an attribute used within the scene graph.

src/osgGLUT/Viewer.cpp

@@ -572,10 +572,13 @@ void displaytext(int x, int y, char *s)
 
 void Viewer::showStats()
 {
+
     static GLfloat tmax=100;
     glViewport(0,0,ww,wh);
     float vh = wh;
 
+    //glPushAttrib (GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT | GL_LIGHTING_BIT | GL_ENABLE_BIT | GL_STENCIL_BUFFER_BIT);
+
     glDisable( GL_DEPTH_TEST ); // to see the stats always
     glDisable( GL_ALPHA_TEST );
     glDisable( GL_LIGHTING );
@@ -811,6 +814,9 @@ void Viewer::showStats()
 
     glMatrixMode( GL_PROJECTION );
     glPopMatrix();
+
+    //glPopAttrib ();
+
 }
 
 void Viewer::display()