Scipy.interpolate no longer contains spline

[din14970]

Super tiny thing which I was able to fix immediately, but I thought I'd report it anyway. I tried running your very old exit wave reconstruction example, which uses the CTF radial_plot function. Trying to call this function throws an error because spline is no longer part of scipy.interpolate. Looking below in the code, it doesn't look like spline is used anyway. Removing it makes radial_plot work again.