- Direct multiply with the conjugate of the estimation for compensation

 - in PTRS processing the default value for DMRS is set outside slot
   processing.

- Removed tx_gain calculations and multiplication with tx signal
- Updated sigma value calculations and removed unused variables
- Re-indent the related code for better readability

Integration 2020 wk45 (2) comprising:

MR937:Nr dl sched fixes  
-restore old phytest scheduler behavior
-correct TA scheduling
-correct SSB
-shorten interface of `nr_fill_nfapi_dl_pdu()`
-Track RB allocation on symbol basis (bitmap)
-add a `remove_nr_ue_list()`, could be used instead of MR !934

MR910:5G SA NAS messages 
- 5G SA nass messages and a simple unitary test code
 
MR927:Nr rrc configuration fr2
- introduces some bug fixes for FR2 that might also have an impact on FR1.

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

 Conflicts:
	openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_bch.c

- Sin cos table quadrant condition checks are updated
- function are indented properly
- Debug prints are updated for double data type

- Added PTRS Symbols in a slot and Resource elements count in debug print

- Most DL code is reused for Ul also to reduce code duplication
- Common CPE calculation function is used for error estimation
- Common slot processing function is used for inter/extrapolation
- Removed old implementation dedicated to UL

- As new sin cos table is used in phase noise function it shall be
  initialized for ULSIM also

- Initialized variable to remove the valgrind issue.

- updated return function value to -1
- removed static variable for dmrs symbol selection for channel
- Updated sin cos quadrant check conditions
- removed casting from PTRS slope and related calculations

The SSB nFAPI message is only sent every 8 frames, and automatically
repeated by the PHY layer in between. This commit sets the vrb_map
structure in those frames in between nFAPI so that the scheduler does
not schedule on such resources.

The phytest preprocessor schedules only one UE, as many RBs as possible
(largest continuous RB region), with a fixed MCS and time domain
allocation.

MR902 Nr mac ssb ro ue idcc
- Construction of SSB-RO mapping table on the UE
- RO selection based on SSB index
- RACH preamble selection based on SSB index in a selected RO
- RA-RNTI calculation
  

MR928 nr: add MAC PDU traces for wireshark
- The T tracer macpdu2wireshark has been modified to handle the new traces. The usage is the same as for LTE.  

MR929 RA fixes for NR UE  

MR938 CI: Parse UE TUN interface correctly in S1 mode
- The TUN interface configuration is changed to use program "ip" only. 
- The CI script parsing is changed accordingly: the pipeline will recognize the attempt to bring up the interface of the first UE.

MR933 nr rlc: bugfix 
- ret.next was not set in a particular case

- Sin and Cos values are obtained from a table with a resolution of
  100.
- dlsim is updated to use this table for phase noise.

- fixed channel compensation by choosing most recent DMRS symbol ina
  slot
- Removed code to find nearest DMRS symbol for channle compensation
- Updated TBS calculation in DLSIM
- Added debug prints in PTRS CPE estimation for DMRS symbol