Matthias Gessinger

When searching for ります, it gets deinflected to "る、りる" (whether this is useful is debatable, but it certainly follows the rules) which then matches the る in 叱る. I believe...

This pull request was inspired by a recent [Numberphile video](https://www.youtube.com/watch?v=OtYKDzXwDEE). The main goal of this PR is the method `fmpz_sum_divisors_proper` which computes the sum of all proper divisors of an...