Store line_style (index of last call to pllsty) in PLStream.   Place at the last place so no API change for now.
Store line_style (index of last call to pllsty) in PLStream.  
Place at the last place so no API change for now.

svn path=/trunk/; revision=11185

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