drvopt had memory management problems (as discovered by valgrind) which are now fixed.
drvopt had memory management problems (as discovered by valgrind) which
are now fixed.

svn path=/trunk/; revision=3892

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