root/pypi: links for quadrigacx

root/pypi quadrigacx-0.6.1-py2-none-any.whl
root/pypi quadrigacx-0.6.0-py2-none-any.whl
root/pypi quadrigacx-0.5.0-py2-none-any.whl
root/pypi quadrigacx-0.4.3-py2-none-any.whl