Ensure qtwidget driver honours calls to plspause - as other interactive drivers do. 
Ensure qtwidget driver honours calls to plspause - as other interactive drivers do. 


svn path=/trunk/; revision=9965

FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot