Extract time series from an SS_output list from a model run.
Returns a data.frame of the results for SSB, recruitment,
forecasts, and effort by year.
get_results_derived(report.file)An SS_output list for a model
(operating model or estimation model).
Other get-results: get_results_all,
get_results_scalar,
get_results_scenario,
get_results_timeseries