Fixed some bugs

+Fixed a "division by zero" error, in Battle.php
+Reworked spied informations, now they're shown only if the building is
at least at level 1. Splitted residence/palace information in two
distinct informations. Now the total crannies capacity is displayed
(even if the capacity is 0) instead of the level of the greatest cranny
+Fixed "getFieldLevelInVillage" function in Database.php
-Removed an useless control in Units.php

GameEngine/Database.php

@@ -3560,7 +3560,7 @@ class MYSQLi_DB implements IDbConnection {
                         )
                     ) as level
                 FROM
-                    ".TB_PREFIX."fdata`
+                    ".TB_PREFIX."fdata
                 WHERE
                     vref = $vid
                     AND