* file bug in libnotify/ubuntu: white background of the clock over the yellow background

DONE:
* file bug in libnotify: icons on libnotify and dbus 0.61 don't work (fixed in new version)
* fix bug in libnotify: Update existing notification doesn't work (was not a bug in libnotify, simply an API strangeness)
* ellipsize body
* ellipsize summary ?
* use the same handle for each buddy, to avoid IM flood
* use buddy avatar if available, fallback to prpl icon
* use icons again
* use hash table again
