The recent upgrade did not deal with obsolete conffiles properly.
Please use the dpkg-maintscript-helper support provided by dh_installdeb
to remove these obsolete conffiles on upgrade.

http://www.debian.org/doc/debian-policy/ch-files.html#s-config-files
http://manpages.debian.net/man/1/dh_installdeb

This bug report brought to you by adequate:

http://bonedaddy.net/pabs3/log/2013/02/23/inadequate-software/

$ pkg=gnome-panel-data ; adequate $pkg ; dpkg-query -W -f='${Conffiles}\n' $pkg | grep obsolete
gnome-panel-data: obsolete-conffile /etc/dbus-1/system.d/org.gnome.ClockApplet.Mechanism.conf
 /etc/dbus-1/system.d/org.gnome.ClockApplet.Mechanism.conf 73984c2647d32b939441e13be8fce2a6 obsolete

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