Sets permissions
Changes in who can view complex item sets and their content:
- the complex item sets pages are visible only to logged in users
- a set is visible only to its author and the editors (both ME and HE) until there is a published question inside it
- when a question inside a set is published, the set itself is considered published, and becomes visible to all logged in users
- an author can see all published questions + his own questions inside a set
- an editor can see all questions related to a set, whatever their status