Bug 13298 - Holds ratios report ignores ordered items

Bug 13298 - Holds ratios report ignores ordered items

The holds ratio report ignores ordered items. This could cause a library
to inadvertently order more copies of a title than they actually need.
An option should be added to count ordered items ( i.e. any negative
notforloan value ).

Test Plan:
1) Apply this patch
2) Create a record with two items, one regular, one ordered.
3) Place 3 holds on the item
4) Run the reserve ratios report, by default you should see this record
5) Check the new 'include ordered' checkbox, rerun the report
6) Note that record is no longer displayed

Signed-off-by: Heather Braum <hbraum@nekls.org>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>