Limit the number of combinations produced for each test case #40
Description
Add functionality to the Combinatorial machine that will calculate the number of combinations that would be eventually generated.
We need this in order to limit the number of generated test cases because in some "simple" situations this could be a problem. Imagine a setup with 10 categories of 5 clean utilities each. All possible combinations are 5^10 = 9,765,625. We do not want to support this (except if it is explicitly allowed) because the generation process will not be that fast in such situations and most likely the UI tools for tests execution would fail to handle this.