Develop integration 2020 weeks 27/28

The following Merge Requests have been included:

* MR 842 : NR RRC HARQ hacks
* MR 843 : hack for RLC AM ACK reporting
* MR 844 : gcc warnings
* MR 846 : nr-rlc: small bugfix
* MR 848 : NR VCD
* MR 852 : bugfix: uplink ACK/NACK reporting through T was gone
* Documentation update
* Some CI improvements

Let's get it back!

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

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

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

Merge branch 'NR_RRC_harq_hacks' of https://gitlab.eurecom.fr/oai/openairinterface5g into NR_RRC_harq_hacks

- UE context status enters RRC_NR_NSA_RECONFIGURED state, after the eNB receives an RRCConnectionReconfigurationComplete message including the
scg_ConfigResponseNR_r15 container.
- Use this state to avoid triggering sGNB Addition Request multiple times

Merge branch 'NR_RRC_harq_hacks' of https://gitlab.eurecom.fr/oai/openairinterface5g into NR_RRC_harq_hacks

changes for ulsim to get functionality back. simulation behaviour for PUSCH is not good (BLER waterfall is way too steep even if SNR threshold is ok). Note develop does more or less the same thing but SNR threshold is lower.

Merge branch 'NR_RRC_harq_hacks' of https://gitlab.eurecom.fr/oai/openairinterface5g into NR_RRC_harq_hacks