Bug 19457: Handle 'PREVISSUE' return by CanBookBeIssued from SIP (CheckPrevCheckout)

If CheckPrevCheckout is set to Do, then checkouts are blocked at the SIPServer

To test:
- Do not apply this patch
- Set CheckPrevCheckout to "Do", or "Unless overridden, do"
Verify the SIP server is blocking checkouts with this setting set
- Apply this patch
- Note that the checkout is now allowed, with a screen message telling
the borrower they've issued the item before.

Signed-off-by: Liz Rea <wizzyrea@gmail.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit b40e58343e)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>

C4/SIP/ILS/Transaction/Checkout.pm

@@ -96,6 +96,9 @@ sub do_checkout {
                     $noerror = 0;
                     last;
                 }
+             } elsif ($confirmation eq 'PREVISSUE') {
+                $self->screen_msg("This item was previously checked out by you");
+                last;
             } else {
                 # We've been returned a case other than those above
                 $self->screen_msg("Item cannot be issued: $confirmation");