For various updatable views based on query.expression:

For various updatable views based on query.expression:
add COALESCE to the insert rule so that we don't always
have to specify a value for the "negate" column.

Also: eliminate a harmless but annoying duplication of
the create statements for the query.expr_xbind view.

M    Open-ILS/src/sql/Pg/002.schema.config.sql
M    Open-ILS/src/sql/Pg/008.schema.query.sql
A    Open-ILS/src/sql/Pg/upgrade/0286.schema.query-coalesce-negate.sql

git-svn-id: svn://svn.open-ils.org/ILS/trunk@16536 dcc99617-32d9-48b4-a31d-7c20da2025e4