Tutka is written by Vesa Halttunen <vesuri@jormas.com>

The tracker widget is based on the Soundtracker tracker widget,
Copyright 1998-2001 Michael Krause <rawstyle@soundtracker.org>,
licensed under the GPL

The spinbutton cell renderer widget is based on the GTK+ 2.0 Tree View
Tutorial spinbutton cell renderer widget,
Copyright 2003 Tim-Philipp Mller <t.i.m@orange.net>,
licensed under the GPL
