[rql annotation] add test and fix for bug introduced by 5004:4cc020ee70e2. While it sounded good, it wasn't because stinfo['relations'] didn't include anymore stinfo['typerels']

# pylint: disable-msg=W0614,W0401
from warnings import warn
warn('moved to cubicweb.dataimport', DeprecationWarning, stacklevel=2)
from cubicweb.dataimport import *