Internal function used by get_results_scenario to calculate the
runtime (in minutes) from a Report.sso file.
calculate_runtime(start_time, end_time)Vector of characters as read in from the r4ss report file
Vector of characters as read in from the r4ss report file
A numeric value representing the number of minutes of total runtime as reported by SS.
This runtime includes the overhead for reading and writing the file up to the Report.sso time stamp.