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-window.cc b/apps/ccnx-consumer-window.cc
index 060b2cc..1dd8369 100644
--- a/apps/ccnx-consumer-window.cc
+++ b/apps/ccnx-consumer-window.cc
@@ -145,7 +145,7 @@
 
 void
 CcnxConsumerWindow::OnContentObject (const Ptr<const CcnxContentObjectHeader> &contentObject,
-                               const Ptr<const Packet> &payload)
+                                     Ptr<Packet> payload)
 {
   CcnxConsumer::OnContentObject (contentObject, payload);
 
@@ -156,9 +156,9 @@
 }
 
 void
-CcnxConsumerWindow::OnNack (const Ptr<const CcnxInterestHeader> &interest)
+CcnxConsumerWindow::OnNack (const Ptr<const CcnxInterestHeader> &interest, Ptr<Packet> payload)
 {
-  CcnxConsumer::OnNack (interest);
+  CcnxConsumer::OnNack (interest, payload);
   if (m_inFlight > static_cast<uint32_t> (0)) m_inFlight--;
 
   if (m_window > static_cast<uint32_t> (0))