Lorentzian fitting and examples, beginning Voigt work
Allowed option for fitting Lorentzians with Model[] function.
This does not provide a better fit than with gaussians: the gaussians are about the right size, but have small tails, and the lorentzians are too narrow but have fat tails.
The peaks are clearly in between Lorentzian and Gaussian.
Hence I have introduced a few basic functions to fit Voigt profiles.
In particular, I have a fast Voigt approximation function (about 3x slower than Gaussian).
It will be integrated into Model[] with the next update. After that, the separate functions for fitting Voigt profiles will be depreciated.