Conflicts:
	targets/RT/USER/lte-enb.c

tested with both EXMIMO and USRP. performance better than in master branch.

When the user clicks on "next UE" or "prev UE" we change the
filters of loggers.

At the same time, the main thread of enb.c processes events
received from the soft-modem and uses the filters, some of them
maybe in the process of being changed.

Changing the filters is not atomic and has to be protected.

Conflicts:
	targets/ARCH/EXMIMO/USERSPACE/LIB/openair0_lib.c

Just below the logo you see the current UE, eg. [UE 0],
and near that you have two "buttons" [prev UE] and [next UE].

You click with left button of mouse on those and the various
plots that depend on the UE are now done for the new UE (say UE 1
instead of UE 0 if you click on [next UE]).

The plots are not cleared when you switch.
Let's say it's a feature.

Merge branch 'feature-21-TM7' of https://gitlab.eurecom.fr/oai/openairinterface5g into feature-21-TM7

Conflicts:
	targets/PROJECTS/GENERIC-LTE-EPC/CONF/enb.band38.tm1.exmimo2.conf

Something went wrong somewhere in the commit history, the function
was not correct.

The most obvious symptom was that way too much SR (scheduling requests)
were given to the UE whenever it had some PUCCH to send.

The case for TDD has not been tested.

Merge branch 'feature-21-TM7' of https://gitlab.eurecom.fr/oai/openairinterface5g into feature-21-TM7

Merge branch 'feature-21-TM7' of https://gitlab.eurecom.fr/oai/openairinterface5g into feature-21-TM7

Conflicts:
	openair1/PHY/INIT/lte_init.c