pgsql: GUC variable pg_trgm.similarity_threshold insead of set_limit()

GUC variable pg_trgm.similarity_threshold insead of set_limit()

Use GUC variable pg_trgm.similarity_threshold insead of
set_limit()/show_limit() which was introduced when defining GUC varuables
by modules was absent.

Author: Artur Zakirov

Branch
------
master

Details
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http://git.postgresql.org/pg/commitdiff/5871b88487cfd07966e2ce08609a4d6d5ee9718e

Modified Files
--------------
contrib/pg_trgm/pg_trgm--1.2.sql |  4 +++-
contrib/pg_trgm/trgm.h           |  2 +-
contrib/pg_trgm/trgm_gin.c       |  8 +++++--
contrib/pg_trgm/trgm_gist.c      |  6 ++++--
contrib/pg_trgm/trgm_op.c        | 45 ++++++++++++++++++++++++++++++++++------
doc/src/sgml/pgtrgm.sgml         | 28 ++++++++++++++++++++++---
6 files changed, 78 insertions(+), 15 deletions(-)