TODO
    ----

    o Features

    - Basic image processing support, eg.
      - contrast 
      - red eye removal
      - brightness
      - sharpening and blurring
      - scaling and rotation

    - Better user interface
      - image zoom button on window border
      - image albums for large image databases
      - thumbnail support
      - additional image info

    - Support for digital cameras


    o Fixes and patch requests

    - when opening a window from external always put the window on top
      and key

    - opening large images should not constrain the image height or
      the image should be scaled to the window size

    - imageView is editable and thus can be dragged, so what should happen
      upon dragging an image inside/outside of ImageViewer?
 
    - optimise default image size