[Feature] Add a test that distinguishes between recursion and excess relatedness

[smasongarrison]

Summary

This feature would allow us to test whether recurrsion (when someone's family tree incorrectly circles back around a.k.a. someone's grandmoth is their child) with excessive relatedness (someone's ancestor is actually in the family tree more than once).

Motivation

This would allow us to better identify unfortunate family situations and distinguish them from data management errors

Implementation

Build a data validation function that checks for both types and reports possible cases that could be either.