Silva-core-smi

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* Update API to Silva 3.0c1.

* Support ``VersionedNonPublishable`` object type.

* Review the settings, access and publishable screen.

* Fix various bugs.

* Improve tests.

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* Rebuild SMI on top of ``silva.ui``. Almost everything changed.

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* Improve CSS.

* Review and improve error pages and theirs CSS.

* Review tab interfaces (introduce a new grouping interfaces).

* Add more support for INonPublishable content object.

* Add more support to skin the SMI.

* Fix various small bugs.

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* Add support to skin the SMI: you can now provide your own CSS for the SMI.
All hardcoded CSS have been removed.

* Tab preview for File and Image have been modernized.

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* The access tab is now implemented in here.

* Middleground actions, navigation, error pages and layout have been
improved.

* Review permissions on buttons and tabs.

* Implement a working Over quota error page.

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* A SMI layout defined using ``silva.core.layout`` has been added. It
includes some CSS and JS resources.

* Forms now use ``zeam.form``.

* Flash messages now use ``silva.core.messages``.

* It is possible to make SMI views and forms using only
``silva.core.smi``, and not rely anymore on old Silva Views macros.