Should we set the lower bound of the xtal2png ranges as 0 or as the minimum across all MP compounds?

[sgbaird]

Implementing for now as minimum across all MP compounds, but this is another hyperparameter choice (technically, the hyperparameter might be a scaling factor between 0 and 1 of the minimum). This would be an alternative to leaving each of the parameter ranges as tunable parameters themselves, and might be a reasonable reduction to the search space (i.e. only leave the upper bound limits as individual tunable parameters).