- added some error checking to avoid crashes (some of this slowed down the code, I think)
- added saving of processing parameters
- updated filenaming in "run_one_brick" (formerly "setup_data", but renamed because it expanded)
- added adjustable frac_red_mean through parameter alpha
- added code to implement skewed normal distribution on prior for x = ln(y/(1-y)) where y = frac_red^alpha (currently not activated in prior)