Old authenticators won't work

[amotzkau]

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The previous authenticator system (before #218) doesn't set session.authenticated anymore. Previously the session object automatically returned authenticated = True when login_data is set. This was removed in 359d9c7946289444f8a0e9dfa09868705427cb3e, therefore subsequent handlers will treat the session as non-authenticated resulting in '5.7.0 Authentication required' errors.