[Debian-astro-maintainers] Bug#849502: Use of embedded external libraries

[Ole Streicher]

I removed the usage of six, configobj, ply, jquery and jquery.dataTables
in the git repository. However, I still cannot remove the use of the
local pytest, since astropy doesn't test successfully with the current
version in Debian (3.0.5). See also

https://github.com/astropy/astropy/issues/5277
https://github.com/astropy/astropy/issues/5670

Once this is fixed, I will remove that as well. It will be switched off
in astropy/tests/helper.py then.