Adding material iteration capability, primarily for Zoo algorithm.
git-svn-id: http://visit.ilight.com/svn/visit/trunk/src@6285 18c085ea-50e0-402c-830e-de6fd14e8384
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git-svn-id: http://visit.ilight.com/svn/visit/trunk/src@6285 18c085ea-50e0-402c-830e-de6fd14e8384