plscheme - htdocs: Added a features listing.

Log Message:
-----------
Added a features listing. A new example appended to the showcase for recently
introduced features.

Modified Files:
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htdocs:
index.html (r1.1.1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/plscheme/htdocs/index.html.diff?r1=1.1.1.1&r2=1.2)