Resolve "For recurrent course edition, offer again button should not be on projects"

Hide the offer again button, unless:

• The user has permission to reoffer the project, and
• The course edition is not recurrent, and
• The project is not linked to a recurrent project (i.e. project in a regular edition, or a nonrecurrent project in a descendent recurrent edition (this makes sense to me but should it be that way?))

Closes #452 (closed)