Need enrolments admin UI

[Matt Giuca]

The enrolment page now allows the enroller to select a role for the enrollee. However, once enrolled, the role for a user with respect to a particular offering cannot be changed. If you try to enrol the same user again, it will report, "User is already enrolled."

Two choices:
a) Allow an already-enrolled user to be re-enrolled if the new role is higher than the user's existing role, or
b) On the enrolments page, have a "change enrolment status" which allows the user's enrolment status to be changed there.

[William Grant (wgrant)]

We need to link to the enrolment listing, and alter it to allow addition/alteration/removal of enrolments.

[Matt Giuca (mgiuca)]

Agree. But also I would implement both (a) and (b) in the original bug report. That is, if you try to enrol someone who is already enrolled, if the new role is higher than the old role, this simply works and their enrolment is upgraded. Possibly also allow it to work if you are *downgrading* someone's role, with the caveat that you need to have permission to enrol their old role to do so. (e.g., a lecturer cannot downgrade another lecturer to a student, but an admin can; further, a lecturer can downgrade a tutor to a student).

[William Grant (wgrant)]

Full enrolment admin UI in trunk r1615.