fixed flatfile option

FYI, I fixed the flatfile option, so one can just use a simple xml file
instead of eXist. I’m keeping eXist as the default, though (since it’s
what I use!), so if you want to use the flatfile option, you need to
explicitly declare the parameter; e.g.:

bibdb=flatfile

Bruce

Oh, and a link for an RSS feed for the repository.

http://www.ceridwen.com/xbiblio/rss.php?
repname=xbiblio&path=%2F&rev=0&sc=0&isdir=1

Bruce