New instances of UserProfile added to AllUsers, not to the receiver
The instance creation methods for UserProfileSet (all methods
beginning with addNewUserWithId:) do not add the instance to the
receiver, but to the UserProfileSet AllUsers. However, the method
UserProfileSet >> add: does add the instance to the receiver.
Also, the method UserProfile class >> newWithUserId:... adds the
instance to the UserProfileSet AllUsers, which means that both
privilege and authorization are required to create a UserProfile.