[migration] mark all version prior 3.7 as non-migrable
API possible used by such old migration script are not supported in recent
Cubiweb.
Closes #2772958
# -*- coding: utf-8 -*-
# copyright %(year)s %(author)s, all rights reserved.
# contact %(author-web-site)s -- mailto:%(author-email)s
#
%(long-license)s
"""%(distname)s specific hooks and operations"""