PrimarySearch: Consider only token clues, force them all to be present

This seems crucial to milking solr for relevant documents, otherwise
we are just overwhelmed by noise.  Our ultimate goal is to get
"Neptune (mythology)" back for query "roman god of sea", but we
still don't now. :-(
PassByClue: Count matches of all clues as equal

This reduces accuracy (% of right answers returned), but increases
recall (% of right answers considered).  Our goal is to enhance accuracy
mainly in candidate scoring, so take the tradeoff for now.
data/eval/: Performance evaluation of latest commits