version 3.3.1
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 New features and user visible changes:

  * Use a GtkHeaderBar instead of a menu and a toolbar.
  * Use the dark theme.
  * Better raw image support, using libraw instead of libopenraw.
  * Image viewer: show a frame around the image; use an overview 
    window to scroll the image instead of the scrollbars; 
    better quality for zoomed out images.
  * Faster image loader for big images.
  * Media player: hide the mediabar after a timeout.
  * Filterbar: added buttons to view the selections.
  * File properties: show only the basic properties, allow to 
    show all of them.
  * Image tools: use a grid layout for the buttons
  * Use a separate dialog for the file tool options.
  * Use symbolic icons everywhere.
  * Added a custom tiff loader.
  * Add a rating-based filter. (Louis-Marie Mouton)
  * App menu: removed 'keyboard shortcuts'.
  * Histogram view: save and restore the scale type.