removed minor AVX2 optimizations from 16-bit turbo decoder. had issues for small block lengths in UE.

bugfixing for UL. Remaining problems: CCE allocations in subframe 5 lead to occasional illegal DCI allocations (affects UL DCI which is missed by UE). waveform compliance with CQI in ULSCH.

changes in BSR handling in eNodeB. UL throughput on 5 MHz is 8 Mbit/s (mcs 19, 20 PRB). MCS 20 is not working for an unknown reason.

modifications in UE NAS to allow OAI UE to connect to. Note this is hard-coded in NAS, it will no longer work with openairCN.  To be fixed before merging into develop branch
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fixed bug in generate_RIVtables for 20 MHz distributed VRB allocations (openair1/PHY/LTE_TRANSPORT/dci_tools.c)

added configuration file for lowband of SoDeRa

changes in lmslib.cpp

increase maximum users in eNodeB to 16

some changes in logging for XFORMS and UL scheduling (activation in all subframes and retransmissions only via PHICH)

changing LOG_E to LOG_W in rx_pucch_emul when UE is not found (this might happen during attach procedure but is ok since nothing will happen)

handling of timing advance is improved. MAC retrieves timing advance from phy once prior to DL scheduling and clears the statistic in PHY. A timer for controlling the timing advance periodicity was introduced.