rewrite segregating simulation functions, output positions between 0 and 1
rewrite functions for simulate segregating site data
compare summary statistics between ms and scrm, for TMRCA, number of seg sites, number of times genealogies change
compare summary statistics between ms and scrm, for TMRCA, number of seg sites, number of times genealogies change
test summary statistics of TMRCA, number of recombination, and number of mutations between ms and scrm