Zc-catalog

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- Nothing changed yet.

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- Add Python 3 compatibility for the ``zopyx.txng3.ext`` stemmer.
See https://github.com/zopefoundation/zc.catalog/issues/4.

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

- Add support for Python 3.4, 3.5, 3.6 and PyPy. Note that the
``zopyx.txng3.ext`` stemmer is not available on Python 3.

- Remove test dependency on zope.app.zcmlfiles and zope.app.testing,
among others.

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- Using Python's ``doctest`` module instead of deprecated
``zope.testing.doctest``.

- Move ``zope.intid`` to dependencies.

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- Fix the extent catalog's `searchResults` method to work when using a
local uid source.

- Replaced a testing dependency on ``zope.app.authentication`` with
``zope.password``.

- Removed ``zope.app.server`` test dependency.

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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.