Abstract X server startup to a new method.
Also: . make sure we erase/fix VisIt's signal handlers in the child. . echo X server command line options to log (always) . add "sleep" to xinit to make sure X will always die. git-svn-id: http://visit.ilight.com/svn/visit/trunk/src@14765 18c085ea-50e0-402c-830e-de6fd14e8384
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