Corrected "get_next_UE_index" and "rrc_remove_UE".
Started communication between RRC eNB and S1ap.
Changed some S1ap structure definitions.
Fixed warnings.

pre-ci ok.

git-svn-id: http://svn.eurecom.fr/openair4G/trunk@4410 818b1a75-f10b-46b9-bf7c-635c3b92a50f