Gocept.country

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- Bugfix: declared namespace package in setup.py

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- Bugfix: added not-equal compare method for db objects

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- Added security declarations for token.
- Bugfix in comparison of db objects, where `isinstance` returns False
for objects of the same type

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- Bugfix in countextual subdivision source: parameters of some methods
where in wrong order.

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- Added contextual country subdivision source, so country subdivisions
can depend on the country.

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- Added support for country subdivisions.