Refining 'overdue' scope after testing.

This will be further refined by setting all older FineArts
orders to 'completed' and filtering them out.
Look for the addition of 'completed' to order_status in a future
issue.
Merge branch 'issue-136' of github.com:uvalib-dcs/tracksys into issue-136

This is what I get from developing on two machines at once...