README for gksu-wrapper

This is a quick and dirty wrapper replacing gksu to use pkexec instead.

I developped it as a workaround for a bug when using a fingerprint reader. with
the MATE desktop. MATE doesn't have an official update notifier yet, so we
have to use GNOME's old one for now; and it uses the deprecated gksu to call
update-manager or  synaptic as root. When used with a fingerprint reader for
authentication, gksu doesn't display any window to signal the user that he has
to swipe his/her finger across the fingerprint reader; this is a known bug and
it won't be fixed because gksu is deprecated in favor of PolicyKit.

TO BE CONTINUED
