Fix issue where xcairo would go through all the pages in a multiple page plot after the return key had been pressed once.
Fix issue where xcairo would go through all the pages in a multiple page plot after the return key had been pressed once.

svn path=/trunk/; revision=7845

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