[test] improve windmill integration, new test on relation edition Changes: - display traceback in case of failure - add new use test for relation edition - edition mode is now possible by toggling `edit_test` or with using "pytest -i" - install firebug extension in edition mode - update documentation

#! /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