Bug#885293: gnumeric-plugins-extra: Depends on unmaintained pygtk

[Jeremy Bicha]

The dependency on python-gtk2 is wrong since gnumeric is a gtk3 app.
Maybe you need to depend on
python3-gi, gir1.2-gtk-3.0
and maybe   libgtk3-perl

I haven't looked very closely.

Thanks,
Jeremy Bicha