[schema] drop CWSourceSchemaConfig[cw_for_source,cw_schema] unique constraint (closes #1946277)
as they are not necessarily unique, eg when one want a configuration for both
subject and object
#! /bin/sh -ecase "$1" in remove) if [ -x "/etc/init.d/cubicweb-ctl" ]; then invoke-rc.d cubicweb-ctl stop || true fi ;;esac#DEBHELPER#exit 0