change showuser command: do not show date_signed_terms if there are no terms to sign
delete obsolete files
remove is_accepted & date_accepted Invitation fields (substituted by consumed & date_consumed reps.)
fix activate view in case of failure
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
fix change user event message format
Fix email text for switching accounts
change user event message format
remove get_or_create_user
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