Find the closest matching inferred sibship to a true sibship
SibMatch(SimX, Infrd, SNPd)
a named numeric vector with the number of matches ('NumMatch'), the position of the best match ('Best'), the inferred sibship size of this best match ('Tot'), the number of matching IDs ('OK'), and the number of mismatches ('err').
a vector with the IDs in the true (Ped1) sibship
a list of vectors with the IDs in the inferred (Ped2) sibships
character vector with IDs of genotyped individuals