Consider using log-domain to type distinguish log-probabilities

[rpglover64]

The log-domain package provides a newtype wrapper and a Num instance for numbers represented by their logarithms. statistics currently provides no type distinction between the output of e.g. probability and logProbability.

Related: #41

[rpglover64]

Instead of log-domain, there's also logfloat, with fewer dependencies.

[Shimuuar]

This is actually good idea