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/model/ccnx-face.cc b/model/ccnx-face.cc
index 77122e0..b1f7b42 100644
--- a/model/ccnx-face.cc
+++ b/model/ccnx-face.cc
@@ -94,6 +94,12 @@
   return *this;
 }
 
+Ptr<Node>
+CcnxFace::GetNode () const
+{
+  return m_node;
+}
+
 void
 CcnxFace::RegisterProtocolHandler (ProtocolHandler handler)
 {