* add the phy abstraction for eMBMS, and the MCH transport info for distributed simulation
* add supports in PDCP to detect the multicast/broadcast packets
* update the readme files, and the script start_one_eNB_multi_UE_nas



git-svn-id: http://svn.eurecom.fr/openair4G/trunk@5079 818b1a75-f10b-46b9-bf7c-635c3b92a50f