EvaluationResult of Negative Binomial number test should return variance / alpha

[pabloitu]

The evaluation function

pycsep/csep/core/binomial_evaluations.py

Line 33 in 5f84ea9

def negative_binomial_number_test(gridded_forecast, observed_catalog, variance):

requires a variance parameter. However, this is not stored in the resulting EvaluationResult. To plot this negative binomial consistency test, the variance parameter is required again, which impedes the EvaluationResult to be a standalone object without the function arguments that created it. I propose to change

pycsep/csep/core/binomial_evaluations.py

Line 68 in 5f84ea9

result.test_distribution = ('negative_binomial', fore_cnt)

to

    result.test_distribution = ('negative_binomial', fore_cnt, variance)

This would imply to remove the variance argument from the plot_consistency_test signature and retrieve it from the EvaluationResult argument the plot function has.