256 cmap1 colours (rather than default 128) to match eighth example from other front ends.  This solves postscript differences introduced by Maurice's recent changes.
256 cmap1 colours (rather than default 128) to match eighth example from
other front ends.  This solves postscript differences introduced by Maurice's
recent changes.

svn path=/trunk/; revision=3586

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