Change in CcnxApp API.  Now callbacks also contain pointer of original
packet (useful to get packet tags, if they exist)

Reflecting changes in PackegTag API

Rescanning bindings

More work on packet-path-weight tracers
diff --git a/apps/ccnx-producer.h b/apps/ccnx-producer.h
index a239d84..45794b2 100644
--- a/apps/ccnx-producer.h
+++ b/apps/ccnx-producer.h
@@ -39,7 +39,7 @@
   CcnxProducer ();
 
   // inherited from CcnxApp
-  void OnInterest (const Ptr<const CcnxInterestHeader> &interest);
+  void OnInterest (const Ptr<const CcnxInterestHeader> &interest, Ptr<Packet> packet);
 
 protected:
   // inherited from Application base class.