Fix the crash I'd caused for plots which use image-based rendering.
Broadcast the image we get on the first processor to all nodes. Make sure we read from the broadcasted image instead of the (now invalid) image compositer output. Move an #if PARALLEL block so we don't have a useless method in the serial build. git-svn-id: http://visit.ilight.com/svn/visit/trunk/src@5456 18c085ea-50e0-402c-830e-de6fd14e8384
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