Made some layout changes, added sorting by rank.

 - SpectrumView is now fullscreen, no more distortion and cutoffs with
   image and graph previews.
 - Sample comparison results are now displayed in order of standardized MSE
   on the list. Independent rankings are assigned and displayed for k-scaled
   and standardized MSE (but standardized is used to determine order).
 - Tapping on an element in the list allows you to remove just that element.