Support display strings that include screen types.
Old code assumed DISPLAYs of the form ":d", but many systems utilize ":d.s" nowadays, where 'd' is the display number and 's' is the screen number. This commits rewrites the machinery to store a string instead of a number for the display, and thus rely on the user giving us the full DISPLAY string, allowing them to set it to whatever the hell they feel like. git-svn-id: http://visit.ilight.com/svn/visit/trunk/src@14776 18c085ea-50e0-402c-830e-de6fd14e8384
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