Spyne

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* Python 3.10 support.
* msgpack 1.x support.
* sqlalchemy 1.2, 1.3, 1.4 support.
* Ported the Http subsystem to Python 3.
* Support for interface document customization.
Thanks to github.com/PyGuDev
* Dropped deprecated integration for SqlAlchemy.
In other words, ``spyne.model.table`` is gone.
* Bug fixes and one DoS fix: GHSL-2021-115.
Thanks to github.com/kevinbackhouse and Github security team.
* Jenkins run: https://jenkins.arskom.com.tr/job/spyne/job/origin-stable/192/

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* Python 3.9 support
* A lot of small fixes here and there.

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* A lot of small fixes here and there blocking the stable release.

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* Test and fix polymorphic roundtrip via XmlDocument.
* Implement support for relationship tables with >2 foreign keys.

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* Implement wrapped/not_wrapped for ComplexModel and HierDict family.

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* Python 3 support is now beta !!!!. All tests pass and there are no known bugs