Add KNNGIST support to contrib/pg_trgm.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: b525bf771e31a2254f28bf25c6ed7987d64c8afb
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2010-12-04T05:16:21Z
Releases: 9.1.0
Add KNNGIST support to contrib/pg_trgm.

Teodor Sigaev, with some revision by Tom

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