we want those traces in the logs people send to us and
the group HEAVY is disabled in the wiki instructions.

looks better

- add mcs to ENB_PHY_DLSCH_UE_DCI
- add mcs, round, first_rb, nb_rb, TBS to ENB_PHY_ULSCH_UE_DCI

add ndi to trace ENB_MAC_UE_DL_SDU

- Msg3 allocation
- initiation of Random Access procedure

The VCD traces have changed. This commit gets in synch
with current status.

to be refined, it's rough

- update T_messages.txt
- update call sites of the T for thoses traces

- adding T macros here and there
- modify the T_messages.txt
- modify enb.c to trace them in the RRC view

plus add rrc connection setup complete tracing

- add group ALL

- add global ON/OFF command line options (OFF is useless but just for
  completeness)

- update X events management
- lock to protect data while plotting (may become a problem in the future)
- better naming of dimensions

this commit should be cut in small pieces
bah

- minor fix