Bug 7611: (follow-up) separate positive and negative statuses as in the past

Bug 7611: (follow-up) separate positive and negative statuses as in the past

This patch preserves someting closer to previous functionality.

Negative not for loan are in the 'unavailable' section in red, positive ones are in the 'reference' section in green. Itemtype level will also be in green in reference

Item specific status will override an itemtype level.

The line break between 'reference' and 'unavailable' existed before and is preserved - negative not for loan and checked out items appear here

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>