Zope.app.preference

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

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- Got rid of ``zope.app.zapi`` dependency, replacing its uses with direct
imports from original places.

- Change mailing address from zope3-dev to zope-dev, as the first one
is retired now.

- Fix tests for python 2.6.

- Remove zpkg stuff and zcml include files for
old mkzopeinstance-based instances.

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- Avoid deprecation warnings for ``ZopeMessageFactory``.

==================

- Initial release independent of the main Zope tree.