Postal-address

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* Add an option to bypass ``Address``' strict normalization.

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* Always sort fields in error messages to improve reproducibility when
unit testing.
* Deduplicate inconsistent field entries in custom address exception.

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* Fix bad released version.

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* Increase capabilities of alias resolution by ``country_aliases()`` method,
which in turns increase address normalization efficiency.
* Remove backward compatibility with ``0.3`` series.
* Remove deprecated ``territory.territory_tree()`` method which provided
backward compatibilityi with the ``0.1`` series. It should have been removed
in the ``0.3.0`` release.
* Split-up ``supported_territory_codes()`` into ``supported_country_codes()``
and ``supported_subdivision_codes()``.

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* Fix rendering of subdivision-less addresses.

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* Fix ``country_code`` to ``subdivision_code`` validation if the latter is not
set.