Plone.z3cform

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* Add a namespace traversal adapter that allows traversal to widgets. This
is useful for AJAX calls, for example.

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* Add batching to ``plone.z3cform.crud`` CrudForm.

* Look up the layout template as an IPageTemplate adapter. This means that
it is possible for Plone to provide a "Ploneish" default template for forms
that don't opt into this, without those forms having a direct Plone
dependency.

* Default to the titleless form template, since the layout template will
provide a title anyway.

* In ``plone.z3cform.layout``, allow labels to be defined per form
instance, and not only per form class.

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* No longer depend on <3.5 of zope.component.

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* Depend on zope.component<3.5 to avoid ``TypeError("Missing
'provides' attribute")`` error.

* Allow ICrudForm.add to raise ValidationError, which allows for
displaying a user-friendly error message.

* Make the default layout template CMFDefault- compatible.

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* Moved Plone layout wrapper to ``plone.app.z3cform.layout``. If you
were using ``plone.z3cform.base.FormWrapper`` to get the Plone
layout before, you'll have to use
``plone.app.z3cform.layout.FormWrapper`` instead now. (Also, make
sure you include plone.app.z3cform's ZCML in this case.)

* Move out Plone-specific subpackages to ``plone.app.z3cform``. These
are:

- wysywig: Kupu/Plone integration

- queryselect: use z3c.formwidget.query with Archetypes

Clean up testing code and development ``buildout.cfg`` to not pull
in Plone anymore.
[nouri]

* Relicensed under the ZPL 2.1 and moved into the Zope repository.
[nouri]

* Add German translation.
[saily]

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* Fix usage of NumberDataConverter with zope.i18n >= 3.4 as the
previous test setup was partial and did not register all adapters
from z3c.form (some of them depends on zope >= 3.4)
[gotcha, jfroche]

* More tests
[gotcha, jfroche]