Correct typo; PLP_pointinpolygon ==> plP_pointinpolygon.
Correct typo; PLP_pointinpolygon ==> plP_pointinpolygon.

svn path=/trunk/; revision=10634

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