Fix to prevent postscript interpreter from forgetting the current point location after a color change.  I lost track of who contributed this.
Fix to prevent postscript interpreter from forgetting the current point
location after a color change.  I lost track of who contributed this.

svn path=/trunk/; revision=1058

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