Flush stdout before issuing error message, to be sure we are really on the text screen.
Flush stdout before issuing error message, to be sure we are really on the
text screen.

svn path=/trunk/; revision=1307

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