Style changes: comments, do loops, indentation, and plcol ==> plcol0.
Style changes: comments, do loops, indentation, and plcol ==> plcol0.

Change 13th example to obtain exact agreement with file results from
corresponding C examples.

svn path=/trunk/; revision=5040

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