closes #601987
1) sqlutils.restore_from_file have to use its confirm argument when
a command fail, to propose to continue there (this can't be handled
by the caller)
2) source.restore method hence needs to take this confirmation callback
as argument
3) properly fix places where 'drop' was given instead of 'confirm'
"""pre 3.2 bw compat
:organization: Logilab
:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
"""
# pylint: disable-msg=W0614,W0401
from warnings import warn
warn('moved to cubicweb.utils', DeprecationWarning, stacklevel=2)
from cubicweb.utils import *