Adding in step and absexp priors of dust and dist #795
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The visualizations of the Scylla and SMIDGE results have shown that the existing prior model in BEAST is not sufficient. Especially when considering the physicsmodel needed for the MegaBEAST (=BEAST prior model). Specifically, the distribution of dust and stars in distance was not modeled as anything other than flat. The stars are generally centered in the plane of a galaxy, often modeled as falling off with some exponential scale height. The is usually seen as concentrated into dust clouds that are located at a specific distance.
Two new prior models are now included "step" (for Av, Rv, fA) and "absexponential" (for dist) to make the priors more realistic.