- Uncomment DHT

- Change DHT from option bit to extension message
- Add DHT start/stop code
- Add UI for DHT enabling
- Add raw datagram protocol type and use for response port

apps/i2psnark/java/src/org/klomp/snark/PeerState.java

@@ -526,10 +526,14 @@ class PeerState implements DataLoader
           setInteresting(true);
   }
 
-  /** @since 0.8.4 */
+  /**
+   *  Unused
+   *  @since 0.8.4
+   */
   void portMessage(int port)
   {
-      listener.gotPort(peer, port);
+      // for compatibility with old DHT PORT message
+      listener.gotPort(peer, port, port + 1);
   }
 
   void unknownMessage(int type, byte[] bs)