pySED-0.3.0

1. Add two flags for better phonon lifetime fitting (lorentz_fit_cutoff and modulate_factor).
2. Add more tips in input_SED.in for phonon lifetime fitting.
3. Add a silicon example for fitting the phonon lifetime of pristine silicon (see Silicon example). All the peaks fitted pretty well. But the SED method in 2010 always underestimates phonon lifetime, since fitting overestimates hwhm.