add a test for index overflow with trees of different heights and refactor a bit #962
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Motivation
The desire for more clarity about the behavior of index overflows in bulk signatures.
Solution
Add a test that shows that an index of (index + (tree height ** 2)) wraps around to the value of the index for trees of different heights.
I'm still wary that I'm doing something wrong and getting a spurious passing outcome. Please review rigorously.