deluge: 1.3.15 -> 2.0.3

* let's try 2.0 version now, no time better than the present! Maybe!
* bz2 -> xz
* maybe python3
* disable pyGtkGlade for deps, maybe not needed?
* fix gtk/etc deps, deluge-gtk works! \o/
* restore installation of images and such

The old version is kept available as some torrent trackers have not
updated their whitelists yet.