Merge branch 'fhg_leo_rebase_w34' of git01.iis.fhg.de:grp-bbc/openairinterface5g into fhg_leo_rebase_w34

    - real curve following the sattelite location
    - new command-line parameters defining the path and user location

    - PID controller implemented
    - post-compensation at UE for DL and pre-compensation at UE for UL

    - post-compensation for UL and pre-compensation for DL
    - offset to be compensated is given through the  command-line option 'FDC'
    - compensation is default activated and it can be deactivated via the command-line option 'FC'

     - post-compensation for DL and pre-compensation for UL

    - command-line option to activate/deactivate compensation added

    - time-variant following a sawtooth shape