_sino_indicator(sino) not robust when weights=0

[cabouman]

Right now the _sino_indicator() function does not use the weight values. This could be a problem if there are large erroneous values in the sinogram with weights of 0.

Should we pass the weights to the _sino_indicator() function?

[cabouman]

Let me modify this. The potential problem is in the function `auto_sigma_prior(sino,delta_channel = 1.0,sharpness = 0.0 )``.

Should this function use the weighted sinogram?

If so, then we would need to modify auto_sigma_prior(), auto_sigma_x() , and auto_sigma_p() so they all take the weights as an input.