Add fetch all support

Currently this fetches the all key from global_index. It's probably desirable to have some switch to fetch only the OOT gnuradio modules.

Also, http://ftp.gnome.org/pub/GNOME/sources/pygobject/2.27/pygobject-2.27.91.patched.tar.gz returns 404. I think it works if you take out the .patched part, but I don't know enough about original intentions there.