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voigt: Voigt line profile

A simple Voigt line profile. The Voigt profile is the convolution of a Gaussian and a Lorentzian. This model uses a pseudo-Voigt approximation which is good to 1% and is due to Ida, Ando & Toraya 2000, Journal of Applied Crystallography 33 (6), 1311.

The parameters are:

par1 $E_l$, line energy in keV
par2 $\sigma$, gaussian line width in keV
par3 $\gamma$, lorentzian FWHM line width in keV
Norm $K$, total photons/cm$^{-2}$/s in the line