root/pypi: links for sagecell

root/pypi sagecell-0.3rc6.zip
root/pypi sagecell-0.3rc6.tar.gz
root/pypi sagecell-0.2rc2.zip
root/pypi sagecell-0.2rc2.tar.gz
root/pypi sagecell-0.1b3.zip
root/pypi sagecell-0.1b3.tar.gz