root/pypi: links for pystructs

root/pypi pystructs-0.3.0.tar.gz
root/pypi pystructs-0.2.1.tar.gz
root/pypi pystructs-0.2.0.tar.gz
root/pypi pystructs-0.1.1.tar.gz
root/pypi pystructs-0.1.0.tar.gz