Use GLEW initializer.
A couple plots were manually initializing GLEW. This makes them use the new avtGLEWInitializer, meaning 1) if both plots are used in a session, GLEW shouldn't get initialized twice, and 2) they can work against Mesa, and thus in SR mode. git-svn-id: http://visit.ilight.com/svn/visit/trunk/src@8022 18c085ea-50e0-402c-830e-de6fd14e8384
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