EditRelationMixIn: stop using user_rql_callback Add generic add_relation/delete_relation ajax functions and use those. Related to #3567793

#! /bin/sh -e

if [ -x "/etc/init.d/cubicweb-ctl" ]; then
    invoke-rc.d cubicweb-ctl restart || true
fi
 
 
#DEBHELPER#
 
exit 0