3.0.0.21
modification in snapshot synchro (some intervals were incorrect) but this was
not detectable with the configurations used for the tests
values < 22 are forbidden for the snapshot period
3.0.0.19
the compliance between the incoming timecode and the CTR value contained in the
TC_LFR_UPDATE_TIME telecommand is checked if at least one TC_LFR_UPDATE_TIME has
been received (this implies the modification of the coarse_time_load register)
lastValidEnterModeTime internal variable management updated