Modify a pre-delete trigger, and add a post-delete trigger, to ensure that

Modify a pre-delete trigger, and add a post-delete trigger, to ensure that
(1) We don't delete/archive a circulation if there are any undeleted renewals
for it, and (2) when we delete/archive a renewal, we also delete/archive
all its predecessors.

Also: expand the view action.circulation to include four new columns.

M    Open-ILS/src/sql/Pg/090.schema.action.sql
M    Open-ILS/src/sql/Pg/002.schema.config.sql
A    Open-ILS/src/sql/Pg/upgrade/0021.schema.triggers-for-deleting-circs.sql

git-svn-id: svn://svn.open-ils.org/ILS/trunk@14145 dcc99617-32d9-48b4-a31d-7c20da2025e4