Wrong beginning of Tau range

[rocomanmelli]

I think this line should have log10(1) which is equal to 0 instead of log10(delta): https://github.com/rpng/kalibr_allan/blob/9d38ea95f70dd39d6380e41e736369c6b0b72530/matlab/SCRIPT_allan_matparallel.m#L41 That way, the range of Tau would go from delta to taumax, not from delta*delta to taumax.