corrected some additional FFT related issues from AVX2 merge when running with real-time MODEM.

Conflicts:
	openair1/PHY/LTE_TRANSPORT/dlsch_demodulation.c

Conflicts:
	cmake_targets/CMakeLists.txt
	openair1/PHY/MODULATION/ofdm_mod.c
	openair1/PHY/TOOLS/lte_dfts.c

added Timing advance tracing to .vcd output. Increase maximum UL RB count to 45. Measured UL throughput @ 15 Mbit/s (40 PRBs).

Conflicts:
	openair1/PHY/LTE_TRANSPORT/print_stats.c
	openair1/SCHED/phy_procedures_lte_eNb.c
	openair1/SCHED/phy_procedures_lte_ue.c
	targets/PROJECTS/GENERIC-LTE-EPC/CONF/enb.band7.tm1.rrh.usrpb210.conf
	targets/PROJECTS/GENERIC-LTE-EPC/CONF/enb.band7.tm1.usrpb210.conf

when doing a merge request from oai-internal to oai.

Merge branch 'Feature-6-fix_test_core_network_with_scenarios' of gitlab.eurecom.fr:oai/openairinterface5g into Feature-6-fix_test_core_network_with_scenarios

Enhancement 64 phy test

this branch (re)-introduces functionality that allows to run the eNB as a signal generator and the UE as a vector signal analyzer (old OPENAIR2=0). 
Tests mostly pass (as good as before).

See merge request !18

Conflicts:
	openair1/SCHED/phy_procedures_lte_ue.c
	targets/SIMU/USER/oaisim_functions.c