Experimental DB pool + fixed stat overflow on equips

Implemented EXPERIMENTAL DBCP (connection pool), trying to improve
concorrent access to DB. Added door portals on Kerning Square. Fixed
equipments getting stat overflow when upgrading stats. Fixed expiring
pets crashing the client in some cases.

src/constants/ItemConstants.java

@@ -26,6 +26,7 @@ import client.inventory.MapleInventoryType;
 /**
  *
  * @author Jay Estrella
+ * @author Ronan
  */
 public final class ItemConstants {
     public final static int LOCK = 0x01;
@@ -89,6 +90,45 @@ public final class ItemConstants {
     public static boolean isPet(int itemId) {
         return itemId / 1000 == 5000;
     }
+    
+    public static boolean isTownScroll(int itemId) {
+        return itemId >= 2030000 && itemId < 2030021;
+    }
+    
+    public static boolean isAntibanishScroll(int itemId) {
+        return itemId == 2030100;
+    }
+    
+    public static boolean isCleanSlate(int scrollId) {
+        return scrollId > 2048999 && scrollId < 2049004;
+    }
+    
+    public static boolean isFlagModifier(int scrollId, byte flag) {
+        if(scrollId == 2041058 && ((flag & ItemConstants.COLD) == ItemConstants.COLD)) return true;
+        if(scrollId == 2040727 && ((flag & ItemConstants.SPIKES) == ItemConstants.SPIKES)) return true;
+        return false;
+    }
+    
+    public static boolean isChaosScroll(int scrollId) {
+    	return scrollId >= 2049100 && scrollId <= 2049103;
+    }
+    
+    public static boolean isRateCoupon(int itemId) {
+        int itemType = itemId / 1000;
+        return itemType == 5211 || itemType == 5360;
+    }
+    
+    public static boolean isExpCoupon(int couponId) {
+        return couponId / 1000 == 5211;
+    }
+    
+    public static boolean isPartyItem(int itemId) {
+        return itemId >= 2022430 && itemId <= 2022433;
+    }
+    
+    public static boolean isPartyAllcure(int itemId) {
+        return itemId == 2022433;
+    }
 
     public static MapleInventoryType getInventoryType(final int itemId) {
 	final byte type = (byte) (itemId / 1000000);