- Lower the lenght of some columns in the database to prevent old MySQL version issues

app/models/item/Item.php

@@ -18,9 +18,9 @@ class Item extends Model {
         $this->_struct = '
         {
             "server" : 
-                {"type":"string", "size":128, "mandatory":true, "key":true },
+                {"type":"string", "size":64, "mandatory":true, "key":true },
             "jid" : 
-                {"type":"string", "size":128, "mandatory":true, "key":true },
+                {"type":"string", "size":64, "mandatory":true, "key":true },
             "node" : 
                 {"type":"string", "size":128, "mandatory":true, "key":true },
             "creator" : 

app/models/presence/Presence.php

@@ -33,11 +33,11 @@ class Presence extends Model {
             "id" : 
                 {"type":"string", "size":128, "mandatory":true },
             "session" : 
-                {"type":"string", "size":128, "mandatory":true, "key":true },
+                {"type":"string", "size":64, "mandatory":true, "key":true },
             "jid" : 
-                {"type":"string", "size":128, "mandatory":true, "key":true },
+                {"type":"string", "size":64, "mandatory":true, "key":true },
             "ressource" : 
-                {"type":"string", "size":128, "key":true },
+                {"type":"string", "size":64, "key":true },
             "value" : 
                 {"type":"int",    "size":11, "mandatory":true },
             "priority" : 

app/models/subscription/Subscription.php

@@ -17,9 +17,9 @@ class Subscription extends Model {
         $this->_struct = '
         {
             "jid" : 
-                {"type":"string", "size":128, "mandatory":true, "key":true },
+                {"type":"string", "size":64, "mandatory":true, "key":true },
             "server" : 
-                {"type":"string", "size":128, "mandatory":true, "key":true },
+                {"type":"string", "size":64, "mandatory":true, "key":true },
             "node" : 
                 {"type":"string", "size":128, "mandatory":true, "key":true },
             "subscription" :