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/Battle.php

@@ -524,7 +524,7 @@ class Battle {
 
         // Formula for calculating the Moral
         if($attpop > $defpop) {
-            $moralbonus = 1 / round(max(0.667, pow($defpop / $attpop, 0.2 * min(1, $rap / $rdp))), 3);  
+            $moralbonus = 1 / round(max(0.667, pow($defpop / $attpop, 0.2 * min(1, $rap / ($rdp > 0 ? $rdp : 1)))), 3);  
         }else{
             $moralbonus = 1.0;
         }