In plhrsh, Hershey symbols will be used if dev_hrshsym is set.
In plhrsh, Hershey symbols will be used if dev_hrshsym is set.

svn path=/trunk/; revision=6068

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