Parser accepts Bernoulli distributions for ill-defined probabilities

Issue #68 resolved
geisserf created an issue

Even in debug mode the parser accepts a Bernoulli distribution for truth values outside of [0,1]. This can lead to ill-defined probability distributions, such as

 Value Probability
 0  3
 1 -2

Unfortunately the isWellDefined method of does also not check if the individual probabilities are < 0 and instead only checks if the sum is equal to 1 (which is valid for individual probabilites 3 and -2.

I'll extend the isWellDefined check and add an assertion to assignBernoulli such that running the parser in debug mode detects this ill-defined domain description.

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