Zope.app.publication

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- Lift the test dependency on zope.app.zptpage.

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- make zope.testing an optional (test) dependency

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

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- Moved EndRequestEvent and IEndRequestEvent to zope.publisher.

- Moved BeforeTraverseEvent and IBeforeTraverseEvent to zope.traversing.

- Removed dependency on zope.i18n.

- Import hooks functionality from zope.component after it was moved there from
zope.site.

- Import ISite from zope.component after it was moved there from
zope.location.

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- An abort within handleExceptions could have failed without logging what
caused the error. It now logs the original problem.

- Moved registration of and tests for two publication-specific event handlers
here from zope.site in order to invert the package dependency.

- Declared the missing dependency on zope.location.

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- Bug fix: The publication traverseName method used ProxyFactory
rather than the publication proxy method.

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- Added a proxy method that can be overridden in subclasses to control
how/if security proxies are created.

- Replaced zope.deprecation dependency with backward-compatible imports