Log Message:
Updated meld to 3.17.0.

2016-12-18 meld 3.17.0
======================

  Python 3 porting:

   * Python 3 support; we now require Python 3.3 as a minimum
   * Python 3 compatibility fixes; too many cases of bytes/string confusion,
     syntax changes and other miscellany to mention individually (Vasily
     Galkin, Kai Willadsen)
   * Handle new unicode-escape behaviour and unicode/bytes confusion for
     process interaction and version control plugins (Vasily Galkin, Kai
     Willadsen)
   * Add support for byte-based filters, to support directory vs. file
     comparison filters (Kai Willadsen)

  UI changes:

   * The "Tabs" menu item has been removed, to better match up with more
     modern GTK+ design. All of the actions are still available in the
     expected key bindings, and there is a new per-tab context menu.
   * The change action buttons in the central pane divider now correctly
     render as flat buttons (Kai Willadsen)
   * The curves in the central pane divider are now... smoother!

  Internal changes:

   * Handle reload notifications better in asynchronous saving (Vasily Galkin)
   * Remove multi-process diff in favour of asynchronous (threaded, but
     GIL-throttled) matching (Kai Willadsen)
   * Performance improvements in rendering of multiple widgets, as well as for
     initial text comparison (Kai Willadsen)
   * Many updates for GTK+ 3.20 and 3.22 ABI changes (Kai Willadsen)
   * NOTE: Windows support is currently untested

  Fixes:

   * Update supported version control list (Kai Willadsen)
   * Update requirements and build requirements lists (Kai Willadsen)
   * Don't create empty help/figures directories (Kai Willadsen)
   * Translation maintenance (Piotr Drąg)