Added variable to store delay time (haven't hooked it up yet--will do shortly)
I hooked up the delay_from_enrollment_to_primary_outcome  variable, which I also added to the boxTable file.
I also modified the user input for recruitment rates (which I shifted to call enrollment rates) so that the user specifies only the combined population enrollment rate, and then the subpopulation enrollment rates are set proportional to subpopulation relative sizes.