Copyright 2008, 2010 Kevin Ryde
This file is part of Gtk2-Ex-Dragger.
Gtk2-Ex-Dragger is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 3, or (at
your option) any later version.
Gtk2-Ex-Dragger is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License along
with Gtk2-Ex-Dragger.  If not, see <http://www.gnu.org/licenses/>.
Version 8, November 2010
    - an actual Glib::Object so can make from Gtk2::Builder
Version 7, October 2010
    - use WidgetEvents for event mask cleanup
    - docs on event mask setups if creating dragger under press event handler
Version 6, September 2010
    - test manifest only as an author test
Version 5, February 2010
    - new home page
Version 4,  November 2008
    - use Gtk2 1.200
Version 3,  September 2008
    - SyncCall split out to WidgetBits
Version 2,  June 2008
    - allow external adj changes during a drag, eg. from the keyboard
Version 1,  May 2008
    - the first version