simplicity 0.4.2

Implementation of simulation of simplicity (https://arxiv.org/pdf/math/9410209.pdf)
Documentation 
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version 0.4.0
    - `in_sphere` and `in_circle` now assume the sphere/circle's points are oriented positive.
      Use `in_sphere_unoriented` and `in_circle_unoriented` if you don't want that assumption.