LDEV-4109: Adding explicit comment style rating support to Peer Review. LDEV-4112: Fixing the previous button - was not detecting the prev case properly and always redisplaying the same screen.
LDEV-4109: Adding explicit comment style rating support to Peer Review. Also fixed a couple of counts that were not calculating correctly - the number of ratings done was being reported on all criteria in the lesson, not the individual criteria.
LDEV-4032 Non-leaders should be forced to wait for leaders to submit notebook and burning questions. Therefore they should not be allowed to press Finish button before these events.