loongson/pypi: links for datatank-py

loongson/mirror datatank_py-0.71.tar.gz
loongson/mirror datatank_py-0.7.tar.gz
loongson/mirror datatank_py-0.6.tar.gz
loongson/mirror datatank_py-0.5.tar.gz
loongson/mirror datatank_py-0.4.tar.gz