Added PerlDL demos and x22 example.  Also, fixed usage of WWW_USER in header.
Added PerlDL demos and x22 example.  Also, fixed usage of WWW_USER in header.

svn path=/trunk/; revision=5546

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