Zc.catalog

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- The package's ``configure.zcml`` does not include the browser subpackage's
``configure.zcml`` anymore.

This, together with ``browser`` and ``test_browser`` ``extras_require``,
decouples the browser view registrations from the main code. As a result
projects that do not need the ZMI views to be registered are not pulling in
the zope.app.* dependencies anymore.

To enable the ZMI views for your project, you will have to do two things:

* list ``zc.catalog [browser]`` as a ``install_requires``.

* have your project's ``configure.zcml`` include the ``zc.catalog.browser``
subpackage.

- Only include the browser tests whenever the dependencies for the browser
tests are available.

- Python2.7 test fix.

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- Remove implicit test dependency on zope.app.dublincore, that was not needed
in the first place.

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* Fixed test-failure happening with more recent ``mechanize`` (>=2.0).

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* Try to import the stemmer from the zopyx.txng3.ext package first, which
as of 3.3.2 contains stability and memory leak fixes.

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* Fix missing testing dependencies when using ZTK by adding zope.login.

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* Add FieldIndex-like sorting support for the ValueIndex.

* Add sorting indexes support for the NormalizationWrapper.