Default is now three panes, but the dockwidgets can be stacked, etc. to
the user convenience.
There's a slight loss in feature since I disabled dockwidgets hiding,
it's simply because some rework is still needed in kdelibs and Qt to
make them work correctly.
svn path=/trunk/playground/utils/dolphin/; revision=609186
Create a DolphinApplication, holding DolphinMainWindows and update
the code to use the DolphinView to get the MainWindow, or get a ptr
to the MainWindow directly. Or if all windows are effected go through
the DolphinApplication to update every mainwindow.
The UndowManager and ProgressIndicator have a rather strange relationship
and will need some more attention but as UndoManager will be killed
anyway I have skipped this.
More cleanup, debugging and thinking is needed.
svn path=/trunk/playground/utils/dolphin/; revision=608945
