Collective-pluggablelogin

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- Nothing changed yet.

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- Avoid double form tags and invalid markup on the registration portlet with
new-style z3cforms.
[davidjb]

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- Allow the registration portlet to work with both new (z3cform) and
old-style (zope.formlib) register forms.
[davidjb]

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* Add id to the login-portlets div, ensuring the element can be selected
on the page.
[davidjb]
* Improve styles for login page, normalising with logged out page.
[davidjb]
* Add logged out page templates to display pluggable login.
[davidjb]
* Improve styles and formatting for login page.
[davidjb]
* Fix issue with empty <div> generated on login page after trailing </html>
end tag.
[davidjb]

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* Initial implementation
[davisagli]