Zope-globalrequest

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- Nothing changed yet.

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- Turn functional tests into better covering unit tests and also add more tests.
This removes test dependencies on unrelated packages.

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- Python 3 compatibility.

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- Lighten test dependencies by using neither `zope.app.testing` nor
`zope.app.zcmlfiles` any longer.

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- Fix import locations and declare all dependencies.
[thet]

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- Fix test setup regarding `zope.securitypolicy`.
[ldr]