develop_integration_w20 into develop

Summary of changes:
- bug fixes
  * UE TDD fixes
  * PDCCH size computation (at phy level, still to be corrected at mac level)
  * DAI increment
  * fix run_enb_ue_virt_noS1 and run_enb_ue_virt_s1 to use Rel14 and
     have --xforms to work
  * compilation warning removals
  * better oaisim logging (print UE security keys,
    print version (git commit ID) at runtime, print working directory)

See merge request !190