2016-04-20 meld 3.15.3
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 Fixes:

  * Handle unicode dates in non-UTF8 locales in folder comparison (Kai
    Willadsen)
  * Try to auto-detect when to use our dark theme highlighting (Kai Willadsen)
  * After undo/redo actions in file comparisons, place the cursor at the
    natural edit position and scroll it back onscreen (Kai Willadsen)