rewrite authorization database and polkit-grant (now known as polkit-auth)

rewrite authorization database and polkit-grant (now known as polkit-auth)

Also,

 - Rename polkit-list-actions to polkit-action.
 - Add a bash completion script to the polkit commandline tools.

Authorizations are no longer world-readable. So for this to work with
hal you now need to do this as root

 # polkit-auth --user haldaemon --grant org.freedesktop.policykit.read

Distributions needs to do this in the %post scripts or similar.

Sorry for this huge monster patch.