Command pip install cython FXrays low_index sphinx sphinx_rtd_theme && pip install --pre --extra-index-url https://test.pypi.org/simple cypari && pip install git+https://github.com/3-manifolds/PLink && pip install git+https://github.com/3-manifolds/snappy_manifolds && pip install git+https://github.com/3-manifolds/Spherogram