plflush ==> plflush().  This change makes this plflush call consistent with the rest and probably also makes a difference to results for interactive devices where plflush is something different than a noop.
plflush ==> plflush().  This change makes this plflush call consistent
with the rest and probably also makes a difference to results for
interactive devices where plflush is something different than a noop.

svn path=/trunk/; revision=11071

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