Now send an initial page clear (tek devices only) on a beginning of page. This helps when there is only one graphics/alpha screen, otherwise is harmless.
Now send an initial page clear (tek devices only) on a beginning of page.
This helps when there is only one graphics/alpha screen, otherwise is
harmless.

svn path=/trunk/; revision=593

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