MsgType: always generate 101 returns

Do not generate the 100 return for books not on loan but always
generate a 101, return ok instead. This is simply as EasyCheck will
otherwise desensitize the chips as it does not understand 100.

Addresses #5

Sip/MsgType.pm

@@ -670,7 +670,11 @@ sub handle_checkin {
     $patron = $status->patron;
     $item   = $status->item;
 
-    $resp .= $status->ok ? '1' : '0';
+# $resp .= $status->ok ? '1' : '0';
+    # Always return "OK" as EasyCheck will desensitize all chips
+    # otherwise. (It throws an error as it does not understand the
+    # message but continues to switch off the alert.)
+    $resp .= '1';
     $resp .= $status->resensitize ? 'Y' : 'N';
     if ($item && $ils->supports('magnetic media')) {
         $resp .= sipbool($item->magnetic);