Create Make_sample_list.R

This function was created to mix the Make_SNP_list_RV with the script used to build the matrix of sampling haplotype information.
Basically we have now a SNP_list (as before) but also two lists H_list_1 and H_list_2. In each, we have two matrix H1 and H2 (rows : SNP positions, col : sampled individuals) indicating the ancestral ("a") or derived ("d") state of the mutation.