Testfixtures

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- Fix bug where bug where duplicated entries in an ordered but partial
:class:`SequenceComparison` could result in a failed match.

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- Add simpler flag support to :class:`StringComparison`.

- Fix deprecation warning about invalid escape sequence.

Thanks to Wim Glenn for the deprecation warning fix.

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- Simplify and clarify the documentation of timezones when using :any:`test_datetime <mock_datetime>` .

- :doc:`api` has been re-arranged to make it easier to browse.

- The ``strict`` parameter to :class:`Comparison` has been deprecated in favour of ``partial``.

- Add :class:`SequenceComparison`, :class:`Subset` and :class:`Permutation` objects.

- Add :class:`MappingComparison` objects.

- Officially support Python 3.9.

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- Add support to :class:`LogCapture` for making sure log entries above a specified
level have been checked.

Thanks to Zoltan Farkas for the implementation.

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- Fix bug where ``ignore_eq`` had no effect on nested objects when using :func:`compare`.

Thanks to Grégoire Payen de La Garanderie for the fix.

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- Fix bugs in comparison of :func:`~unittest.mock.call` objects where the :func:`repr` of the
:func:`~unittest.mock.call` arguments were the same even when their attributes were not.