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Refs: #2363

remove is_accepted & date_accepted Invitation fields (substituted by consumed & date_consumed reps.)

snf-manage commands: do not send activation email in active users & do not allow inactive users to send invitations

shibboleth signup form throughs validation error in case of an inactive account with conflicting email

 
keyword argument request is not passed in PasswordResetForm.save(), use BASEURL setting instead of building it from the request

Refs: #2291

* unique email and is_active combination (use django model validation)
* use different template for rendering shibboleth signup form
* do not show groups in profile page
* do not show provider in third-party signup forms

Refs: #2167

Refs: #2291

Refs: #2267

Conflicts:
	snf-astakos-app/astakos/im/models.py
	snf-astakos-app/astakos/im/views.py

Refs: #2167

Refs: #2167

Conflicts:
	snf-astakos-app/astakos/im/forms.py
	snf-astakos-app/astakos/im/templates/im/approval_terms.html

Conflicts:
	snf-astakos-app/Changelog

include required queue imports only if QUEUE_CONNECTION is set