Generate the website png files with -dev pngcairo (rather than -dev png).
Generate the website png files with -dev pngcairo (rather than -dev png).

Add examples 26, 27, and 28 to website png files that are generated and
also the website sourcefiles for all languages.

Add Fortran 95 and Ada example source files to website.

svn path=/trunk/; revision=7885

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