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)