[Debian-astro-maintainers] purify is marked for autoremoval from testing

[Debian testing autoremoval watch]

purify 2.0.0-1 is marked for autoremoval from testing on 2016-12-19

It (build-)depends on packages with these RC bugs:
841610: statsmodels: FTBFS: TypeError: cannot sort an Index object in-place, use sort_values instead