Updated ethics, diagram, report & user stories

modified the ethic application - replaced camera recording with
researcher observation, added references to sprint reviews, added
repetition of 'Voluntary, Withdraw, Omit' in 'What do I do?' section of
Information Sheet, added invitation to project demos to debriefing;
added more detail to system architecture diagram;
shortened figure captions in report and added references to them;
fixed user stories - moved one of them to 'As a dean...' section, added
business value (filled out these values for 'As a student...' section);