See #490 discussion.
This reverts commit 1278859d31, reversing
changes made to 0c020c98f9.
Conflicts:
pkgs/desktops/xfce/core/xfce4-session.nix (take master)
pkgs/lib/misc.nix (auto)
This should solve many issuses, including:
- show mountable volumes and mount-on-click (in Thunar)
- fix shutdown actions (and don't ask for password anymore)
It doesn't explicitly depend on anything in x-updates,
but AFAIK noone has tested it against master (yet).
Connected to #441.
