plSetOpt -> c_plSetOpt name change; invisible to C/C++ users.
plSetOpt -> c_plSetOpt name change; invisible to C/C++ users.

svn path=/trunk/; revision=3130

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