- new definition to replace hardcoded values

limit dl_DataToUL_ACK to the number of slots per frame to avoid the need to resize VRB_map and UL_tti_req_ahead

Almost all targets used both SIMU and SIMU_COMMON. So instead of
linking one in the other, this commit merges both libraries into a
common SIMU lib.  Further, we never load SIMU dynamically -- hence
make it a static library.

Also, this commit cleans up CMakeLists.txt to prevent multiple
compilations of taus.c

- The qsort() function is defined as:
  void qsort(void *base, size_t nmemb, size_t size,
    int (*compar)(const void *, const void *));
  and sorts an array with nmemb elements of size size.
- in the gNB scheduling functions, nmemb and size were swapped
- this was causing a stack overflow ending with a SEGFAULT under certain circumstances

- this defition is obsolete

Direct check on dlsim buffer

full symbol buffer will be written bt DFT

removed gNB_id and slot from function calls where proc is used.

--Removed NR_UE_PDSCH global structure
--Changed UE scope to accomodate local PDSCH data
--Removed common_vars.rxdataF from global structure

integration_2022_wk50

See merge request oai/openairinterface5g!1869

!1663 UL-MIMO working with 2 layers
!1705 RNTI to UE ID in PDCP, SDAP, GTPU, ...
!1818 Move /targets/user to /executables
!1835 Improve NR SRS configuration
!1837 Add Configuration File Naming Style Guide
!1852 Get data from SRB 1 when generating Msg4
!1857 Use F1AP to transfer SRB1 messages in monolithic mode
!1858 fix NR_LDPC_NUM_BN_GROUPS_BG2_R15
!1862 Fix for msg3 scheduling
!1814 Initial web server implementation
!1847 Move 5G RFsim tests from RAN-CI-develop to RAN-Container-Parent
timeout for RFsim

This will lead to quicker drop of the UE context in the gNB once it
disconnected from RFsim.