Allow simulated data start/end times to be set
In the DAG set up it doesn't currently allow you to set the start time, end time, or data time step for simulated data. This MR adds this ability, including adding it to the simulation class.
In the DAG set up it doesn't currently allow you to set the start time, end time, or data time step for simulated data. This MR adds this ability, including adding it to the simulation class.