The CP length was hard coded for numerology 1

- now done according to the proper DL/UL frequency
- this makes it compatible with FDD mode

This commit contains work done by Eurecom and by Benetel.

implementation of missing symbol-based rotation for NR modulation/demodulation (Section 5.3 38.211). Tested with unitary simulators (ulsim/dlsim).
To be tested with gNB testbench and rfsimlator

	-Increase buffer size in PHY_ofdm_mod to accomodate FeMBMS sizes
	-New FFT sizes added (IDFT_12288, IDFT_24576) to enable support for FeMBMS 10MHz and 20MHz channels BWs

Signed-off-by: Javier Morgade <javier.morgade@ieee.org>

For whatever reason most of the files had their permission
changed from 644 to 755, which is not wanted.

0. unwiring of 40 MHz channel hard-coding and general SSB location
1. PSS dynamic range improvement and DC carrier fix
2. SSS channel estimation and detection corrected
3. PBCH channel estimation fixed
4. PBCH channel extraction/compensation reworked for the general case
5. fixed-point low-complexity polar decoder integrated to PBCH decoding chain

works by default (nr_pbchsim) at 100 MHz / 30 kHz SCS and SSB wherever (but known to UE)

log.c simplification, fix usefull functionality which never worked, move all log code from openair2 to common

removed "short_offset" code from normal_prefix_mod. removed static declaration in PHY_ofdm_mod which was a cause for problems when parallelizing FFTs for FEP TX.

This reverts commit ce14050b, reversing
changes made to 0ada1e9e.

Beamforming is now only done when necessary. This patch is based on one from enhancement-10-harmony.