Fix python-2.6 BaseException 'message' attribute deprecation.
* bzrlib/util/configobj/configobj.py:
(ConfigObjError.__init__): 'message' attribute has been
deprecated. Reported upstream with patch, hopefully next upgrade
will include it. Watch for conflicts though.
* bzrlib/errors.py:
(BzrError._format): 'message' attribute has been deprecated.