Bug 20472: Add format field to the interface

Bug 20472: Add format field to the interface

We need to add the format to the forms entering new requests:
  opac/opac-request-article
  circ/request-article
If the pref contains multiple formats like SCAN|PHOTOCOPY, the first listed
format will be preselected on the request form. If there is only one option,
we should not disable the select however. (Possibly hide it.)

If we have no mandatory fields, we should not allow the submit of a complete
empty form (check on OPAC).

And we need to show the format of pending requests on forms:
  opac/opac-user
  circ/request-article (biblio detail tab)
  circ/article-requests (staff form to handle requests)
  members/moremember (Article requests tab at the bottom)
  circ/circulation (Checkout/Article requests tab)
Note: The last two forms use the same include file.

Test plan:
[1] Add an article request via opac or staff. Choose Scan.
[2] Verify that you see the Scan format on opac-user and the
    above-mentioned staff forms.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>