Illumination of the pupil should be improved

This ticket is from the series ``Improvements to the PSF 2d modeling, April 2019 brainstorming''.

The illumination of the pupil, especially the wide wings has been implemented poorly. At the moment, the illumination is combination of two components: 1. Just top hat with FRD Gaussian broadening and 2. ``Lorentzian'' component that should mimic the wide wings that we see in theta. The actual resulting illumination is then a linear combination of these two components. For vast majority of images the algorithm end in extreme in which there is only ``Lorentzian'' component. In addition, residuals of the defocused images often show rings showing that the illumination of the pupil was not able to capture the wings seen in the data.

In short, modeling the illumination of the pupil should be improved.