=============

Break render into two pieces to give sub-classes more control over
rendering procedure.


TGLViewer
=========

Render axes/guides before selected/highlighte objects so that
depth-test can be honoured (if requested).


git-svn-id: http://root.cern.ch/svn/root/trunk@24316 27541ba8-7e3a-0410-8455-c3a389f83636