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-hijacker.cc b/apps/ccnx-hijacker.cc
index 0bcad9d..f09b098 100644
--- a/apps/ccnx-hijacker.cc
+++ b/apps/ccnx-hijacker.cc
@@ -98,9 +98,9 @@
 
 
 void
-CcnxHijacker::OnInterest (const Ptr<const CcnxInterestHeader> &interest)
+CcnxHijacker::OnInterest (const Ptr<const CcnxInterestHeader> &interest, Ptr<Packet> packet)
 {
-  CcnxApp::OnInterest (interest); // tracing inside
+  CcnxApp::OnInterest (interest, packet); // tracing inside
 
   NS_LOG_FUNCTION (this << interest);