GUI code for parallel GPU configuration.
Finally! GUI elements to set n-gpus-per-node, X arguments, and whether or not VisIt should launch X. Also removed the pre/postCommand widgets, as they haven't been utilized for a long time now. git-svn-id: http://visit.ilight.com/svn/visit/trunk/src@14781 18c085ea-50e0-402c-830e-de6fd14e8384
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