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/server/partyquest/MonsterCarnival.java

@@ -147,8 +147,9 @@ public class MonsterCarnival {
         }
 
         public void saveResults() {
-            Connection con = DatabaseConnection.getConnection();
+                Connection con = null;
                 try {
+                    con = DatabaseConnection.getConnection();
                     PreparedStatement ps = con.prepareStatement("INSERT INTO carnivalresults VALUES (?,?,?,?)");
                     for (MapleCharacter chr : red.getMembers()) {
                         ps.setInt(1, chr.getId());
@@ -165,6 +166,7 @@ public class MonsterCarnival {
                         ps.execute();
                     }
                     ps.close();
+                    con.close();
                 } catch (SQLException ex) {
                     ex.printStackTrace();
                 }