Silva-core-views

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* Update interface documentation.

* Fix a bug where a silvaviews.View would not render the expected content.

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* Update imports due to API changes.

* Update test setup, use new test infrastructure.

* Properly set HTTP headers on Pages as well.

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* Form code move to ``silva.core.forms``.

* Layout system is now based on ``infrae.layout``.

* HTTP headers have been improved to be customized, HEAD requests should set
the Content-Length of the content if possible.

* absolute_url is now available on versions and test requets.

* Update to match publisher changes in Zope 2.12.

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* Add some support to set HTTP headers on content and views.

* Manage HEAD requests on content and views.

* Create a layout support by using five.megrok.layout.

* Add support to create public forms.

* Add the possibility to change widget rendering style between
different z3c forms.

* Improve form and form templates, more support for status messages.

* Add the possiblity to remove the cancel button on z3c forms by using
an interface.

* SMI forms should be registered on the SMI layer.

* Use silva.translations for translations support.

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* Add generic ZMI form.

* Update forms macros.

* Use five.grok viewlets instead of a local implementation.

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* Initial release