turn default logging threshold to warning (we usually want them), and log 'no schema for eid' pb using warning instead of error, so we see them in logs but not during migration
"""this contains the cube-specific entities' classes
:organization: Logilab
:copyright: 2001-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
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:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
"""