Changed introductory two paragraphs.  These paragraphs will also be used for promotional purposes.
Changed introductory two paragraphs.  These paragraphs will also be used
for promotional purposes.

svn path=/trunk/; revision=2987

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