--removed artifacts from mutation rate estimate to clean up real_data_random & remove excess calls to find_end
--fix typo in util
--global_vars summary stats label system currently crashes if no real data is provided. Decided it made more sense to make 'msprime' the default label instead.
--removed artifacts from mutation rate estimate to clean up real_data_random & remove excess calls to find_end --fix typo in util --global_vars summary stats label system currently crashes if no real data is provided. Decided it made more sense to make 'msprime' the default label instead.