Add the "rectangular" optional argument to plshades. With this change example x22f gives exactly the same results as x22c.
Add the "rectangular" optional argument to plshades. With this change example x22f gives exactly the same results as x22c.

svn path=/trunk/; revision=12821

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