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-consumer.h b/apps/ccnx-consumer.h
index e53ff89..9f2ae53 100644
--- a/apps/ccnx-consumer.h
+++ b/apps/ccnx-consumer.h
@@ -62,11 +62,11 @@
   // OnInterest (const Ptr<const CcnxInterestHeader> &interest);
 
   virtual void
-  OnNack (const Ptr<const CcnxInterestHeader> &interest);
+  OnNack (const Ptr<const CcnxInterestHeader> &interest, Ptr<Packet> packet);
 
   virtual void
   OnContentObject (const Ptr<const CcnxContentObjectHeader> &contentObject,
-                   const Ptr<const Packet> &payload);
+                   Ptr<Packet> payload);
 
   virtual void
   OnTimeout (uint32_t sequenceNumber);