Add some meat to this chapter that at least points to the working demos as a stopgap measure. Later should be done right.
Add some meat to this chapter that at least points to the working demos
as a stopgap measure.
Later should be done right.

svn path=/trunk/; revision=2581

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