[packagekit] Python GTK Client

[Sebastian Heinlein]

Hello,

I just started the work on a gtk client based on packagekit.client. I
will push the results to packagekit-gnome in a separate branch in the
next days.

Richard, would it be possible to store the user interface messages in a
(xml) catalog to share translations and provide a common look and feel?
This should also help the kde guys.

Cheers,

Sebastian