Changed stream variables vpx.. to vdx.. since they now hold the relative device coordinates (0 to 1) rather than the physical coordinates.
Changed stream variables vpx.. to vdx.. since they now hold the relative
device coordinates (0 to 1) rather than the physical coordinates.

svn path=/trunk/; revision=1406

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