Zope-app-exception

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- ``ISystemErrorView`` interface has been moved to
``zope.browser.interfaces``, leaving BBB import here.

- Cut dependency on ``zope.formlib`` by requiring newer version of
``zope.app.pagetemplate`` which now contains ``namedtemplate``.

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- Use new ``zope.authentication`` instead of ``zope.app.security``.

- Removed deprecated code and thus removed dependency on zope.deferredimport.

- Removed old zpkg-related SETUP.cfg file.

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- Substitute zope.app.zapi by direct calls to its wrapped apis. See
bug 219302.

- Fixed author email and home page.

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- Resolve ``ZopeSecurityPolicy`` deprecation warning.

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- Initial release independent of the main Zope tree.