Update of simplepie.inc to the latest version (1.3.1, downloaded from simplepie.org).
Update of simplepie.inc to the latest version (1.3.1, downloaded from simplepie.org).

svn path=/trunk/; revision=12565

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