Autopkgtest for gff2ps

[Liubov Chuprikova <chuprikovalv@gmail.com>]

Hi Andreas,

I have just pushed an autopkgtest and a simple patch to fix gff2ps so that it exits with "0" when a run is successful. Please, check out my commits!

I am going to look into the python packages Steffen wrote about.

With regards,

Liubov