This reverts commit ce14050b, reversing
changes made to 0ada1e9e.

The abstraction mode of oaisim does not work for the moment, it's better
to exit than to crash somewhere randomly.

                since two rx threads (even/odd) are used by OAI-UE

changed the memory allocation of txdataF and beam_weigths

Beamforming is now only done when necessary. This patch is based on one from enhancement-10-harmony.

Some of them might not be correctly handled.
I put /* TODO: XXX */ where I didn't know if
the fix was correct.