EPA channel model. -gV, -gW, -gX.

Adding the updated CSI option for retransmission of TB1 in TM4. Pass -U from the command line to enable.

The independent retransmission of TB1 will take data from the last PUSCH
report, when both TB were active and keep it for all the retransmission
rounds.
Now the TPMI for the retransmissions of TB1 is passed from the command
line with -K(tpmi): -K0 for Alamouti, -K5 for PUSCH column1 , etc.

Modifying some printouts into the file.

Intermediate commit. Adding HARQ support for SIC receiver. Changes in dci_tools.c to map TB to CW in a proper way.
Enable different options for TB1 retransmissions. Needs further improvements.

Counting for the number of 2CWs or 1CW retransmissions.
Adding corresponding changes to the phy_scope.

2.Fixing modulation for TM2 in dlsch_modulation.c
The branch now passes dlsim tests.

Conflicts:
	openair1/PHY/LTE_TRANSPORT/dlsch_modulation.c

Resolve "OAI-UE, DFT segmentation fault"

Closes #130

See merge request !42

Merge branch '130-oai-ue-dft-segmentation-fault' of https://gitlab.eurecom.fr/oai/openairinterface5g into 130-oai-ue-dft-segmentation-fault

2. Fixed a bug for HARQ rounds for TM1 frequency selective with PCE.

If your configuration file does not contain a parameter
the softmodem only printed "Failed to parse eNB configuration file"
without telling you what parameter was not found.

This quick fix adds a warning in such cases.

It also exists at the first error rather than trying to
parse the rest of the configuration file.

This hotfix does not change the processing at all.
At this point, stat_re == 0, so the behavior is the
same as before. But the code was wrong. There should
have been no test, it's a NACK, period.

Enhancement 16 tm rrc reconfig

This branch contains enhancements regarding signalling of the transmission mode
It also contains fixes for TM2, which now works with commercial phones
TM3 also works, but only with single layer
TM4 needs further improvements in uplink signalling (will be done in another branch)
All tests that pass for develop also pass for this branch (see https://gitlab.eurecom.fr/oai-internal/openairinterface5g/builds/560)

See merge request !41

Conflicts:
	openair2/RRC/LITE/rrc_eNB.c
	targets/PROJECTS/GENERIC-LTE-EPC/CONF/enb.band7.tm1.usrpb210.conf

pdcch is now filled with dummy data (like it used to be) to enable better estimation of signal energy (also in unitary sims and oaisim)