MacOS: no dirty indicator in window close box

Original [issue 29](https://code.google.com/p/scythebill-birdlist/issues/detail?id=29) created by adam_winer on 2011-01-25T02:38:37.000Z:

From http://developer.apple.com/library/mac/#documentation/Java/Conceptual/Java14Development/07-NativePlatformIntegration/NativePlatformIntegration.html

To display an indicator that a window was modified, you need to use the Swing property Window.documentModified. It can be set on any subclass of JComponent that implements a top-level window using the putClientProperty() method. The value of the property is either Boolean.TRUE or Boolean.FALSE.

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