Cleanup order of tabbed dock widgets.

With the increasing number of additional dock widgets is has
been required to cleanup grouping on initial startup.

The resulting order is:
- Tree view and uml object related dock widgets are tabbed
  into one group at the top left area.
- Documentation, undo stack, protocol and debug dock widgets
  are tabbed into one group at the bottem left area
- Welcome page and bird view are tabbed into the right area.

BUG:372253


FIXED-IN:2.20.80 (KDE Applications 16.11.80)

Signed-off-by: Ralf Habacker <ralf.habacker@freenet.de>