Brought error testing out of test_calc_rad_loss() and into new function, test_calc_rad_loss_errors().  Changed arrays to astropy Quantities in this new function and time arrays from numpy datetime64 to datetime objects.
Brought error testing out of test_calc_rad_loss() and into new function,
test_calc_rad_loss_errors().  Changed arrays to astropy Quantities in
this new function and time arrays from numpy datetime64 to datetime objects.

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