lib/parse-sexp: support phrase queries.

Anything that is quoted or not purely word characters is considered a
phrase.  Phrases are not stemmed, because the stems do not have
positional information in the database. It is less efficient to scan
the term twice, but it avoids a second pass to add prefixes, so maybe
it balances out. In any case, it seems unlikely query parsing is very
often a bottleneck.

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