Dynamic filters (from metabib.record_attr) are now parsed along with
search strings and facets as Query Parser descends the parse tree. The
WHERE clause for the query as a whole is now a combination of the main
WHERE and the ON clause for JOINing to metabib.record_attr. This gives
us the ability to create complex boolean nested queries using
SVF/record_attr filters, unlike before where nested filters were either
ignored or always treated as global filters.