Right now we have functions that get cophenetic distance matrices from trees and get distances from acmaps. We need to work on distance interfacts that take a vector of strings and a model (tree or map), and only output a distance matrix for the strains in the inputted vector. This would involve a validation step to make sure the same names exist in the provided tree or map. We would also direct users to the underlying conversion function if they just want to convert everything that's in the model.