Silva-pas-base

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* Update API to Silva 3.0c1.

* Add more options to the cookie PAS handler.

* Improve login mechanism when using AJAX requests, login form and
login cookie.

* Improve tests.

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* Update for Zope 2.13 and Python 2.7.

* Update SMI interfaces to use ``silva.ui``.

* Improve cookie PAS plugin.

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* Update code to use new member service API (MemberErrorLookup).

* Refactor login form HTML (complete change to use div).

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* Update code to use Zope 2.12.

* Remove deprecation under Silva 2.3. This is now the required minimal
version. We now use Grok to register ourselves.

* Update the cookie plugin: the username and password are no longer
contained in the cookie, but a secret validated against the Silva
Secret Service.

* Update the cookie plugin: the login is now a page that is rendered
inside the public layout.

* The member service have been extends to support PAS groups. This is
now the official method to implement groups in Silva.

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* Set a lifetime to the cookie set by SilvaCookieAuthHelper. [antonin]

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* Always unquote came_from when it's fetched from the request in the
logout link. Some proxy requote it more. [sylvain]