Synnefo

Fix model_to_dict utility

fix project table queryset, minor other fixes

Project action fix

show leave action also when user requested to join the project

Fix third party signup form

when active approval terms exist

fix user_visible_by_last_of_chain()

ProjectApplication.objects.user_visible_by_last_of_chain()
would erroneously list more than one application per chain.
This was due to this behaviour (bug?) in django:

x = objects.values('chain').annotate(last_id=Min('id'))...