Bug 13990: ILS-DI LookupPatron requires ID Type

Bug 13990: ILS-DI LookupPatron requires ID Type

Patch provides a constrained set of borrower attributes to try in turn if the
ID type is not specified.  Also added "email" to the POD documented list of
id types seeing as its quite a useful one for integration developers.

Test plan:

1) without the patch applied, turn on ils-di interface in your admin sysprefs
   and then try accessing the URL:

   https://your-server/cgi-bin/koha/ilsdi.pl?service=LookupPatron&id=Mabel

   replacing "your-server" your Koha dev test domain name (localhost:8080 if
   you're using a kohadevbox VM) and "Mabel" with the first name of a patron
   (Mabel is in the test database already if you're using that).

   You should get back an error message in the XML.

2) Apply the patch and repeat. This time you should get an <id> element in
   the XML with Mabel's patron ID in it.

Signed-off-by: Mark Tompsett <mtompset@hotmail.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>