Zope.app.rotterdam

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- Removed not needed test dependency on ``zope.app.zptpage``.

- Replaced test dependency on ``zope.app.securitypolicy`` by
``zope.securitypolicy``.

- Using Python's ``doctest`` instead of deprecated ``zope.testing.doctest``.

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- Fix tests using a newer zope.publisher that requires zope.login.

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- Use zope.container instead of zope.app.container.

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- Resolve ``ZopeSecurityPolicy`` deprecation warning.

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- Initial release independent of the main Zope tree.