Visualizing uncertainty

[hneth]

As of now, only plot_curve has an option for expressing uncertainty about parameter values (by setting the uc argument to a percentage value, resulting in ranges of uncertainty around a given parameter value). One could argue that uc — by being a numeric value — actually represents a form of risk. But irrespective of semantics, it would be desirable to include some means of expressing imprecision or vagueness in the other representations.

Perhaps a simple solution (or fall-back option) would be to specify parameter ranges (e.g., from min to max) and then create 2 graphs that represent the best and worst case scenarios?