root/pypi: links for metalang

root/pypi metalang-0.52.tar.gz
root/pypi metalang-0.51.tar.gz
root/pypi metalang-0.50.tar.gz
root/pypi metalang-0.49.tar.gz
root/pypi metalang-0.49b.tar.gz
root/pypi metalang-0.48a.tar.gz