F&R corrections

Dave Beckett mentioned on #swig that the F&R document is wrong w.r.t.  
the mention of Redland and Rasqal. The F&R mentions that Redland  
supports COUNT() and project expressions. I think the confusion here  
is that, to the best of my knowledge, Redland supports the syntax for  
these features, but has no query engine support for them. Perhaps the  
next revision of the F&R document can be updated to clarify this issue.

greg