Changing internals. PIT, FIB, CS, and ForwardingStrategy now are aggregated onto the node

Also, CcnxStackHelper provide an easy way to set up individual
parameters for them.
diff --git a/model/ccnx-pit.h b/model/ccnx-pit.h
index 84b1685..826f49f 100644
--- a/model/ccnx-pit.h
+++ b/model/ccnx-pit.h
@@ -150,11 +150,6 @@
     return m_PitEntryPruningTimout;
   }
   
-  /**
-   * \brief Set FIB table
-   */
-  void SetFib (Ptr<CcnxFib> fib);
-
 protected:
   // inherited from Object class                                                                                                                                                        
   virtual void NotifyNewAggregate (); ///< @brief Even when object is aggregated to another Object
@@ -190,6 +185,8 @@
   Time    m_PitEntryPruningTimout;
   Time    m_PitEntryDefaultLifetime;
 
+  uint32_t m_maxSize;
+
   Ptr<CcnxFib> m_fib; ///< \brief Link to FIB table
 };