Removed many old deprecated :mod:`unittest` features:
:class:`~unittest.TestCase` method aliases, undocumented and broken
:class:`~unittest.TestCase` method ``assertDictContainsSubset``,
undocumented :meth:`TestLoader.loadTestsFromModule
<unittest.TestLoader.loadTestsFromModule>` parameter *use_load_tests*, and
an underscored alias of the :class:`~unittest.TextTestResult` class.
