Bug 25815: SIP Checkout: add more information on why the patron is blocked.

Bug 25815: SIP Checkout: add more information on why the patron is blocked.

Currently, on SIP checkout, Koha only returns "Patron Blocked" when there is
a problem with the patron.

This patch adds more specific informations, with the following messages:

 - "Patron expired"
 - "Patron debarred"
 - "Patron has fines" (see system preference "noissuescharge")
 - "Patron blocked" (see system preference "OverduesBlockCirc")

Test plan:

 - Try to do a SIP checkout with a patron that is in one of the above situations.
 - Check that the displayed message matches the patron's situation.

Signed-off-by: Sonia <sonia.bouis@univ-lyon3.fr>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>