Changed the colour map routines to simplify them a little, then changed the routines a little so they make better use of the full dynamic range of cmap1 in cases where cmap1 happens to be larger than the internal space. That complicated things a little, but on the balance things work better now.
Changed the colour map routines to simplify them a little, then changed the
routines a little so they make better use of the full dynamic range of cmap1
in cases where cmap1 happens to be larger than the internal space. That
complicated things a little, but on the balance things work better now.

svn path=/trunk/; revision=2827

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