Temporarily replace plbox (which has an API problem) with Box_Around_Viewport.
Temporarily replace plbox (which has an API problem) with
Box_Around_Viewport.

svn path=/trunk/; revision=7401

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