Tab layout for imagesets on team profile view

If the ImageTagger is used frequently teams will have several datasets making some kind of sorting an importing feature. A first step would be to include a tabbed layout, e.g. "default", "date created", "by size", "test sets", where the default behavior is retained with the "default" tab and the others sort image sets by date of creation, number of images and "test*" matching the beginning of a dataset's name respectively.

3ff1e24 implements the tabbed layout. Right now, the tabs are static and not adaptable by the teams.