Comment 1 for bug 1786312

IRC discussion for reference:

http://irc.evergreen-ils.org/evergreen/2018-08-09#i_371513

The gist is we want to continue the practice of resuming overdues after the newly applied due_date without back-filling overdues, however we also want to know the amount billed as overdue fines from all existing fines before applying new ones, not just those that were created after the new due date.