Bug 26503: Add limit for standing orders to acq advanced search

Bug 26503: Add limit for standing orders to acq advanced search

This allows to filter on standing orders on the acq advanced search
checkbox. For this purpose a new checkbox is shown behind the order
status search option.

As both not yet ordered and standing orders have the status
'new' or partially received internally, this seems like a good
placement as it will help distinguish these cases clearly.

new + standing order = standing order, but nothing received yet
partially received + standing order = active standing order
all status + standing order = all standing orders

To test:
- Create some baskets with at least one order, some 'standing' and
  others not
- In the top toolbar choose tab Orders search > Advanced search
- Make some searches with and without the new 'Standing order' option
- Verify the right orders are found
- In the search results standing orders will now show with the
  status + (standing order).

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>