cubicweb-registration #2455455 Have an extranet option for invite only websites [open]

It would be useful to have the following :

  • activate the cube registration
  • have an option "invite-only"
  • give access to admins to the /register form
  • don't ask admins for the password (only login/email/firstname/surname) (no captcha)
  • the email is sent and when confirming the registration the user selects a password
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