Make exact distance match for FTS phrase operator

Teodor Sigaev <teodor@sigaev.ru>

Commit: 028350f619f7688e0453fcd2c4b25abe9ba30fa7
Author: Teodor Sigaev <teodor@sigaev.ru>
Date: 2016-06-27T17:41:00Z
Releases: 9.6.0
Make exact distance match for FTS phrase operator

Phrase operator now requires exact distance betweens lexems instead of
less-or-equal.

Per discussion c19fcfec308e6ccd952cdde9e648b505@mail.gmail.com

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