[dataimport] Add a ``flush`` method for all stores. For ``ObjectStore``, ``RQLObjectStore`` and ``NoHookRQLObjectStore`` the method tries to call the ``commit`` method. For ``SQLGenObjectStore``, the ``flush`` method is basically unchanged with respect to previous changesets.

+
−from os.path import join
+
−assert __file__.endswith(join('scripts', 'script2.py')), __file__
+
−assert '__main__' == __name__, __name__
+
−assert ['-v'] == __args__, __args__