Allocation overview should display that a student is not enrolled anymore

[Dagefoerde]

A student who rates choices and then leaves the course (or maybe her enrolment expires) is not allocated by the algorithm. That person is still displayed in the Allocation overview, and is listed as a person who was not allocated. This may be irritating, as this might at first suggest that the allocation was not done because of that person's priorities.

I am not suggesting to drop the names from the overview; it is still helpful to know who voted. Instead, I'd suggest marking those who are not enrolled anymore in a distinct way, e.g. via icons, text colour, or additional text.