First version without error during the simulation.
* Now external meter modules are part of a new Ethernet MAC module (i.e., EtherMAC2withOutputQueueAndMeter).
* Renamed DRRVLANTokenBucketQueue to DRRVLANQueue.
* Created a new compound module NgnAccessNode2 with EthernetMAC2withOutputQueueAndMeter.
* Deleted IQoSMeter.h.