Including Wolf-Rayet stellar atmosphere models

[galaxyumi]

We are working on extending the current BEAST stellar atmosphere models to include WR models and probably non-LTE O/B star models. There are multiple PoWR models with different hydrogen mass fractions. We need to figure out if there is a parameter in stellar evolutionary models that could be used to map to each PoWR model grid or not. If not, we can have separate libraries for different hydrogen mass fractions and leave it as an option for the users to choose which model grid to use. Maude Gull is going to figure out at which logT, logg (or logL) we need to switch to WR models from non-LTE OB models.