Improved item & drop-point checking + Dojo fixes + Duey revamp

Fixed some issues with items being dropped sometimes out-of-reach and in a weird way.
Improved item checking function, now looking up one-of-a-kind items properly.
Fixed some issues with dojo skills and possible exploits in dojo progression.
Improved Duey, now displaying better info to players.

src/net/server/channel/handlers/MesoDropHandler.java

@@ -31,7 +31,8 @@ import client.MapleClient;
  *
  * @author Matze
  */
-public final class MesoDropHandler extends AbstractMaplePacketHandler {//FIX
+public final class MesoDropHandler extends AbstractMaplePacketHandler {
+        @Override
         public final void handlePacket(SeekableLittleEndianAccessor slea, MapleClient c) {
                 MapleCharacter player = c.getPlayer();
                 if (!player.isAlive()) {