Zc-catalog

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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.

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* Fixed a typo in ValueIndex addform and addMenuItem

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

* Use ``zope.keyreference`` instead of ``zope.app.keyreference``.

* Use ``zope.intid`` instead of ``zope.app.intid``.

* Use ``zope.catalog`` instead of ``zope.app.catalog``.