Zope.app.publication

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- Add missing test dependency on zope.testing.

- Remove test dependency on zope.app.exception.

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- Test fix: HTTP request should not have leading whitespace.

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- Reenabled a test which makes sure ``405 MethodNotAllowed`` is returned
when PUT is not supported. This requires at least version 3.10 of
zope.app.http.

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- Use the standard libraries doctest module.

- Include the ``notfound.txt`` test again but reduce its scope to functionality
relevant to this distribution.

- Notify with IStartRequestEvent at the start of the request publication
cycle.

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- Fix up tests to work with newer zope.app.wsgi release (3.9.0).

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- Don't depend on zope.app.testing and zope.app.zcmlfiles anymore in
the tests.