Refactoring ToDo, Wishes, Suggestions

Naming

• We currently use the modules plugins/backend/saml2.py and plugins/frontend/saml2.py. We should rename them to saml2_be.py and saml2_fe.py to clarify in the logfile whether a message was issued by pysaml2 or satosa.

• Satosa knows 2 relay_states, one for the frontend and one for the backend. These should be named accordingly in State.state_dict to be self-documenting when looking at the data, or merged into a single relay_state. IIUC satosa only checks that relay_state is returned unchanged.

• InternalData: We should find a non-generic name for this data structure; "internal data" could be anything.