allCrosses              Generate all crosses from given parent set.
calcCost                Function to calculate N_total by the algorithm
                        proposed by Sevin et al. (2004)
calcCostAll             Function to calculate the number of necessary
                        individuals and generations as the crossing
                        cost for all the crossing schemes. This is the
                        wrapper function of calCost.
findPset                Find parent sets from the candidate cultivars
getFromAll              Function to get one crossing scheme from all
                        the crossing schemes.
util_haplo              Util fuunction to generate haplotype dataframe
                        from raw data.
util_recom_mat          Util function to generate recom_mat from raw
                        data. It returens the recombination probability
                        based on Halden's map function
