add another foaf to demonstrate failures

in trying to build a failing test for #104, i added another foaf so that the foaf queries in the tests would match 2 friends rather than just one.  in adding this extra triple, i think i've uncovered a number of other issues.  i've opened this PR as a way to have a discussion around whether or not my expectations are correct.  i'll make more specific notes on the commit to help give context for the discussion.
thanks for the explanation. 51e26a751ceff059c5c2299a78dc6f095ac6a4b9 forces `{ joinAlgorithm: 'basic' }` but no luck - it's still just giving one result.