Add support for plimage() amplitude clipping. Enable reploting images to a slow device.
Add support for plimage() amplitude clipping.
Enable reploting images to a slow device.

svn path=/trunk/; revision=3625

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