Bug 18104 - allow SIP2 field AE (personal name ) to be customized

Bug 18104 - allow SIP2 field AE (personal name ) to be customized

Koha's SIP2 server sends the patron's name in the format "Firstname
Surname" which is not very good for machine reading. We need to allow
the format of the patron name to be customized in a manner similar to
what is done with the DA field on bug 16755.

Test Plan:
1) Apply this patch, start or restart your SIP server
2) Find a patron with a first and last name
3) Send a patron information request via the sip2 cli tool
4) Note the AE field has the format "<firstname> <surname>" ( i.e. the current behavior )
5) Add this parameter to the login stanza you are using:
   ae_field_template="[% patron.surname %][% IF patron.firstname %], [% patron.firstname %][% END %]"
6) Restart your SIP server
7) Repeat step 3
8) Note the AE field now has the format "<surname>, <firstname>"

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Benjamin Daeuber <BDaeuber@cityoffargo.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>