renaming variable name in ccoding_byte_NB_IoT.c,  renaming function of lte_rate_matching_NB_IoT.c, adding new file:crc_byte_NB_IoT.c, adding missing functions to defs_nb_iot.h

Merge branch 'develop-nb-iot-mac' of https://gitlab.eurecom.fr/oai/openairinterface5g into develop-nb-iot-mac

adding NPDCCH structure for UE specific and Common Search space. To be implemented NPDCCH repetitions.Code Copile. 145 Warnings

introduction of some UE-specific parameters for NPDCCH (Seems missing in FAPI for the moment). Code copile, 149 warnings

Merge branch 'develop-nb-iot-mac' of https://gitlab.eurecom.fr/oai/openairinterface5g into develop-nb-iot-mac

Adding preliminary .config file for nb-iot (to be completed), adding EARFCN calculation for configuration with corresponding table for UE cat NB1/NB2

Merge branch 'develop-nb-iot-mac' of https://gitlab.eurecom.fr/oai/openairinterface5g into develop-nb-iot-mac

Merge branch 'develop-nb-iot-mac' of https://gitlab.eurecom.fr/oai/openairinterface5g into develop-nb-iot-mac

 adding some consideration and implement some checking based on FAPI specifications for ndlsch path. Function for encoding, modulation ecc.. still to be added. Code Compile. 144 warnings

modified conditions for triggering the npdsch_procedure, still modulation, encoding...functions to be integrated. Warnings 144.Code compile

Setup of required variables for managing the SI messages transmission, according to our Assumptions. Still to include the function for encoding, scrambling ecc.. of npdsch and npdcch for the DL path. Code compile. 141 Warnings

Merge branch 'develop-nb-iot-mac' of https://gitlab.eurecom.fr/oai/openairinterface5g into develop-nb-iot-mac

path for NDLSCH procedure almost completed (missed coding, modulation and scrambling functions). Code compile. 140 warnings

Merge branch 'develop-nb-iot-mac' of https://gitlab.eurecom.fr/oai/openairinterface5g into develop-nb-iot-mac

merge with nick branch for synch.

almost complete the ndlsch and npdcch path. missed the coding, modulation and scrambling function.Code compile. 140 warnings

Correction of some bugs on coding files, starting implementation of single thread dlsch procedure (schedule_responce, generate_dlsch_params ecc..), Code Compile. Still 150 warnings

Merge branch 'develop-nb-iot-mac' of https://gitlab.eurecom.fr/oai/openairinterface5g into develop-nb-iot-mac

merging for synchronization with nick work

start modification for HARQ process and adding major strucutres to PHY_vars_eNB. Code not compile. dci_nb_iot.c to be added to CMakeList