Implement option HAVE_PDL_GRAPHICS_PLPLOT_40 (default OFF) to let the user specify that he has PDL-Graphics-PLplot version 0.40 or higher installed.
Implement option HAVE_PDL_GRAPHICS_PLPLOT_40 (default OFF) to let the user
specify that he has PDL-Graphics-PLplot version 0.40 or higher installed.

This is just an interim measure and should be replaced with a test for version
0.40 or higher.


svn path=/trunk/; revision=9036

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