It should be impossible to use two-variable measures with three-variable functions

[kahaaga]

It should not be possible to use a bivariate measure such as MIShannon with a three-or-more-input method like independence(indep_test, x, y, z). In these cases, only multi-variable measures should be accepted.

One possible solution is to encode the minimum number of input variables needed for each measure as a type argument, and error if not enough datasets are provided. EDIT: alternatively, and preferably, implement a minimum_input_args function for each of the measures that gets called before actually computing a measure.