[PATCHES] Whip polkit into shape

[Andy Wingo]

Attached are three patches to polkit.  The first makes polkit use
elogind for seat management.  The second is based on a WIP patch from
Mark, and arranges for polkit to look in the system profile for rules
and actions.  The third adds a polkit service.  I've tested these by
running "pkaction" and "pkcheck", both with an embedded authentication
agent and with an external agent.  Kinda cool to see these work.
Unfortunately I haven't gotten user-mode "loginctl reboot" to work --
for some reason it doesn't end up spawning the authentication agent
correctly.  Oh well, future work.  Usually people will be running with a
authentication agent linked to their graphical session anyway.

BTW, for XFCE there appears to be this thing: 

  https://github.com/ncopa/xfce-polkit

See also:

  https://wiki.archlinux.org/index.php/Polkit#Authentication_agents

Cheers,

Andy