Bug 27907: Add support for circulation status 2 ( on order )

Bug 27907: Add support for circulation status 2 ( on order )

In Koha, we represent on order items by giving those items a notforloan
value less then zero. We can use this to implement circ status 02 ( on
order ) in for SIP.

Signed-off-by: Christopher Kellermeyer - Altadena Library District <ckellermeyer@altadenalibrary.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>