Bug 29002: Circulation

Bug 29002: Circulation

This patch adds handling for circulation of booked materials.

We prevent checkouts of booked items during the booking period where the
booking is for another user.

We update the due date to match the end of booking period when checking
out to the user who the booking is for.

If a checkout would overlap a booking to another user, we ask the user if
they will accept a reduced due date so the booked item is returned in
time to fulfill the booking.

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Janet McGowan <janet.mcgowan@ptfs-europe.com>
Signed-off-by: Caroline Cyr La Rose <caroline.cyr-la-rose@inlibro.com>
Signed-off-by: Laurence Rault <laurence.rault@biblibre.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>