liquid_feedback_core: update/core-update.v1.4.0

liquid_feedback_core

Use different transaction isolation levels in "lf_update" program

rev	line source
jbe@194	1 CREATE OR REPLACE VIEW "liquid_feedback_version" AS
jbe@194	2 SELECT * FROM (VALUES ('1.4.0', 1, 4, 0))
jbe@194	3 AS "subquery"("string", "major", "minor", "revision");