only with XFORMS enabled.

The way it was done was confusing.
However, now rank adaptation (if enabled) is not visualized correctly.

fixing handling of ndi/first_tx in dci. commenting out corner case of missed ACK, this needs to be done better

re-adding the possibility in dlsim to bypass the DCI/PDCCH generation. This is necessary for accuracy of the dlsim-tests, which are working again now.

- rename UE_NO_LOG to DISABLE_LOG_X
  because the name is misleading. The full software
  is impacted, not only the UE part
- same for compilation option ---ue-no-log
  that becomes --disable-log
- keep LOG_X for the standard case, that is the
  case without DISABLE_LOG_X where printf has been
  put. Two reasons:
  * printf is not realtime friendly
  * keep behavior similar for other users who may
    be troubled by different logs that don't add
    any benefit to previous logs

We have to not only ensure that the CCE is free but
also that it's below the number of availables CCEs
with respect to the current PDCCH size.

we can compute CCE_max_used_index out of the loop.

get_nCCE returns the number of available CCEs.

We can put the CCEs numbers [ 0 .. get_nCCE-1 ],
so we need to use <, not <=.