LP 1833284: Option to send database id in LookupUser response

LP 1833284: Option to send database id in LookupUser response

Autographics can track users who change barcodes or have more than one
barcode by using the user's unique ID.  To implement this feature, we
have added an option to return the user's unique database id instead
of the barcode in the LookupUser response message.  Autographics will
use the database id to track the user on their side, and use the
barcode that the patron entered in all other requests.

The new option is lookupuser_send_database_id and can be activated in
the patrons element of oils_ncip.xml.  See the updated example for
documentation comments.

Signed-off-by: Jason Stephenson <jason@sigio.com>