Portend

=====

5: Restored use of ``portend.client_host`` during
``assert_free`` check on Windows, fixing check
when the bind address is ``*ADDR_ANY``.

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Use tempora.timing.Timer from tempora 1.8, replacing
boilerplate code in occupied and free functions.

1: Removed ``portend._getaddrinfo`` and its usage in
``Checker.assert_free``.

Dropped support for Python 2.6.

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Remove dependency on ``jaraco.compat`` and instead just
copy and reference the ``total_seconds`` compatibility
function for Python 2.6.

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* 2: Use tempora, replacing deprecated jaraco.timing.

===

Expose the port check functionality as ``portend.Checker`` class.

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Correct failures on Python 2.6 where
``datetime.datetime.total_seconds``
and argparse are unavailable.