Periodically refresh the neighbourhood of matches #133
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Currently, the
/search?n=${n}&o=${o}endpoint computes a globally optimal best match. It puts the top-500 globally optimal matches' personality vectors intosearch_cache. These personality vectors form a "neighbourhood" of the best match. Prior to this PR, for performance reasons, Q&A search computed a locally optimal new best match, only within this neighbourhood. This PR refreshes the neighbourhood sometimes---Not so much that Q&A search is slow and uses lots of CPU time, but not so little that users are unlikely to find their best match without refreshing the app.