Comment 5 for bug 1616170

WIP branch with a refactor of the mentioned subroutine in Circulation.PM and new columns based on the magical statuses for constants.js, as well as checkin_ok and a copy_status_event so that events don't need to be hardcoded: https://git.evergreen-ils.org/?p=working/Evergreen.git;a=shortlog;h=refs/heads/user/khuckins/lp1616170-custom-copy-status-maintainability

TODO:
- Ensure SIP/Item.PM available subroutine is factoring in is_available
- Make use of the cancel_transit_on_abort field in __abort_transit and apply cancel_transit_on_abort values in data.seed-values