Surface book stopped date and make it editable

Description of your request or bug report:

Follow up from Bug: Setting book to "stopped" removes start date

Make the stopped date visible, and potentially make it editable

I think maybe the same Reading/Finished window might be able to do the job.


For the editable place, if there’s no good place for now, can it be just be thrown into the data manager until a better place is found?

Trello link:

Approved. Not sure when it’ll happen, but good to log.