refactor session_key (__errorurl) to handle cases where the form is generated throuhg an ajax call: in case of an entity form, return the entity's absolute url. Also allow to force session key value

#! /bin/sh -e
 
case "$1" in
    remove)
	if [ -x "/etc/init.d/cubicweb-ctl" ]; then
	    invoke-rc.d cubicweb-ctl stop || true
	fi
    ;;
esac
 
#DEBHELPER#
 
exit 0