Added capability to calc_rad_loss() to also output cumulative radiated losses in as a function of time via the cumulative kwarg.
Added capability to calc_rad_loss() to also output cumulative radiated losses
in as a function of time via the cumulative kwarg.

dpshelio/sunpy,dpshelio/sunpy,Alex-Ian-Hamilton/sunpy,Alex-Ian-Hamilton/sunpy,Alex-Ian-Hamilton/sunpy,dpshelio/sunpy