This reverts commit d96450d8.

Conflicts:
	master/bt5/vifib_payzen/bt/revision

Try to register only if previous one has been sucesffuly registered.

Worklist for planned and confirmed transaction requires being Assignee.

Focus on social authentication, propose BrowserID as fallback.

Comes from http://zocial.smcllns.com/

form_id was dirty hack. Improve the message.

Use special section to support more software in the future.
Force authorisation before requesting kvm.

Also force authorisation to see software list.

Reuse cookie on client side in order to avoid need to pass thru parameters to
authorisation servers.

Support form_id in login_form from request as something "hidden", which can be
preprocessed as url and later passed to authentication backend.

Keep endpoint traditional_login_form in order to use old style login.

Multiple Person can come from different sources (FB, G+, BID, ...) and they
can have same email.