Implementing base support for TCP-style window-based limiting on per-FIB-prefix and per-face granularity

Currently, limits are supported only by ndn::fw::Limits forwarding
strategy and only at the very basic (not fully tested) level.
diff --git a/model/fw/fw-stats.cc b/model/fw/fw-stats.cc
index de30473..959d25f 100644
--- a/model/fw/fw-stats.cc
+++ b/model/fw/fw-stats.cc
@@ -167,9 +167,9 @@
 
 
 void
-FwStats::WillErasePendingInterest (Ptr<pit::Entry> pitEntry)
+FwStats::WillEraseTimedOutPendingInterest (Ptr<pit::Entry> pitEntry)
 {
-  super::WillErasePendingInterest (pitEntry);
+  super::WillEraseTimedOutPendingInterest (pitEntry);
 
   m_stats.Timeout (pitEntry->GetPrefix ().cut (1));