I modified the multipass csg discretization so that it can be specified
if all the regions should be discretized at once or individually.
Currently, it is hardcode to do them individually, but I will add a 
user control for VisIt 2.9. 



git-svn-id: http://visit.ilight.com/svn/visit/trunk/src@25093 18c085ea-50e0-402c-830e-de6fd14e8384