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