This code removes the custom pagination in KNSBackend in favour of using the internal pagination in KNSCore::Engine. It further removes the explicit call to request data, as this is already done by setting the search term, which caused duplicated results to be returned. Further, remove results already returned when KNS requests the view to be cleared, further reducing duplicate view entries.
nb: The fact setting the search term starts a new search is undocumented, which will need fixing (some thorough documentation work is ongoing in kns as part of a gsoc project)