Allow users to enter report reasons longer than 128 characters
The current limit is 128 characters. This should be something larger, such as 256. In order to implement this we need to change the two places in do.py
that check the reason length, and we need to add a migration to remove the 128 character limit from the database (I think we should remove it entirely rather than changing it as we don't gain anything from having it there). It would also be a good idea to check the mod report views for display problems caused by long reasons.