develop_integration_w15 into develop

Summary of changes:
- DCI1 20MHz phy-test bug fix
- RLC UM/AM max header size fix
- UE autotests improvements

See merge request !177

- RBs set to 25
- disable SRS

In 20MHz the UE didn't do any uplink granted by DCI0.
It was replying to RAR, so uplink decoding was okay.

Turns out the DCI0 structure for TDD was wrong.

Merge remote-tracking branch 'origin/bugfix-234-rlc-um-max-header-size' into develop_integration_w15

Fabrice Nabet (TCL) suggests the value 128 for both.
See https://gitlab.eurecom.fr/oai/openairinterface5g/issues/234#note_3179

The constant RLC_UM_SEGMENT_NB_MAX_LI_PER_PDU is set to 24. This is
too low. Running a downlink TCP iperf with a 10MHz or 20MHz cell
leads to lots of the following warning in the log:

[RLC][W][SN 792] Bad RLC header! Discard this RLC PDU (size=618)

The problem is that the uplink RLC PDU contains a lot of TCP ack.
We can see much more than 24 of them. The RLC layer is not happy
and discards the PDU.

Putting 256 for RLC_UM_SEGMENT_NB_MAX_LI_PER_PDU (arbitrarily chosen,
big but not too big) solves the problem, at least for 10MHz.

it was:

    *num_li_pP >= RLC_UM_SEGMENT_NB_MAX_LI_PER_PDU

it should be:

    *num_li_pP > RLC_UM_SEGMENT_NB_MAX_LI_PER_PDU

develop_integration_w14 into develop

Summary of changes:
- minor bug fixes, minor improvements

See merge request !173

Using "system" to call "git log" is too error-prone.
In the test setup, lte-softmodem was blocked because
"git log" uses a pager ("less") and the pager was
waiting for the user to press enter.

We could pass "--no-pager" to "git log" but then
what if someone runs the softmodem out of the source
tree?

cmake defines PACKAGE_VERSION, we can use that instead,
as is done in openair-cn.

This reverts commit 7f24927c.

With value 13 uplink TDD for a 10MHz configuration was not working.
UDP traffic sent with: "iperf -c XX -u -b10M" was crashing
the eNB.

Develop integration w13

Summary of changes:
- RLC AM reworking (a lot has changed)
- several bug fixes
  * support processing multiple MAC RAR control elements in a single MSG2
  * fix ACK/NACK resetting
  * do not correct USRP frequency from carrier offset estimation when --ue-carrier-scan == off
  * fix TDD uplink due to incorrect PUCCH format for SR in TDD
  * several other simple fixes
- better support for LMS SDR

See merge request !168

- define _GNU_SOURCE before including pthread.h
- do not use static for the array 'threadname' used
  to store the name, it makes it a global variable
  accessed by several threads in parallel
- increase size of 'threadname' (maybe not necessary)
- properly indent #define / #under (# should be at column 1)

When you ran it with the scope as:

    ./dlsim -X

you saw no activity in the "PDSCH I/Q of MF Output" window,
so matter what SNR you put (even for very high SNR, say: ./dlsim -X -s40)

this commit seems to fix it.

I am not sure it is the end of story. The 2 threads PDCCH/PDSCH structures
may still not be used correctly everywhere.