Name of common block changed from plplot (which nameclashes) to plplot_tr_block.
Name of common block changed from plplot (which nameclashes) to
plplot_tr_block.

svn path=/trunk/; revision=6559

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