Constraining prior distributions for priors without a maximum value defined

[olelod]

To constrain the prior input using well logs does not work for prior distributions without a maximum value defined:

This has an effect on the normal and log-normal distributions. For a normal distribution it can be fixed with using a truncated normal distribution instead - so we can issue a warning/error in the config parsing stating this. There is probably not an easy fix for the log-normal distribution other than not allowing for constraining the prior when the prior is a log-normal distribution.