* The slot object updates its name every time it is saved
* But sometimes its slotrooms are changed underneath it, and so the
name can become out of date
* This method is a simple way of updating the names for all the slots
In many parts of the schedule there are multiple slots with the same
start/end times, and it can be hard to find the one you want to edit.
Make this slightly simpler by listing the room names in the admin list.
