Sourceforge project and it's website (which includes the documentation) is gone.
Bug #1338580 reported by
Kenny Gryp
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manual.xml (DocBook XML) and manual.html (rendered from XML) are present under the "doc" subdirectory.
It seems to be the same doc as it was on sf.net. I used archive.org to get the documentation from sf.net. I only looked at it for a quick glance, but it looks very close to the same.
I think it's a good thing that the project is gone from sf.net, because that version was the first hit reported by Google for a long time, but it was out of date and misleading.