some cleanup of irrelevant objects (e.g. removal of remaining OrganisationType)

removed old references to the Amoeba gem which was used to clone models. Fixed typo in Question.deep_copy. Added generic test for deep_copy methods.

added unit tests for question. removed unused methods from question. fixed guidance_for_question method so that it does not require us to pass in itself (was qustion.guidance_by_question(question, org) - now question.guidance_for_org(org)) and updated template that calls method accordingly