We have a strange problem with the timestamp of the very
first packets received from the LimeSDR that leads to
a complete failure of the eNB.

A simple workaround is to discard the first RX packet
just after a "start" of the device.

We also change the value of "tx_sample_advance" to a more
reasonable value. The problem of timestamp was "solved"
differently in the past and at the time we needed to put
a much higher value.

This may have to be refined at some point.

develop_integration_w12 into develop

Summary of changes:
- RRC Rel14: tests done so far indicate no problem
- SRS support in eNB
- bug fixes / warning removals

See merge request !155

The presence of one or the other may lead to some failure/crash in
some situations.

This generates too much prints and may disrupt realtime.
This has to be off by default.

The files NativeInteger.c.diff and constr_SET_OF.c.diff
from asn1c were generating compilation warnings. We had
local patches applied on generated files by asn1c.

A new version of asn1c has been pushed to
https://gitlab.eurecom.fr/oai/asn1c
(commit 224dc1f991b7e7ad705ce92e171b942f87b7b7e7)
making obsolete the fixes we do here.

So we now remove those fixes.

*************************
* IMPORTANT BEGIN       *
*************************

Everyone should update their asn1c installation.

The simplest is to do:

    source oaienv
    cd cmake_targets
    ./build_oai -I

*************************
* IMPORTANT END         *
*************************

not sure of this one, to be checked