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* Press 'b' to toggle max/0 opacity.
* Fixed a typo in preference name that broke binding.
* Added a preference to apply shading to main display only. I want th…
…is to completely black the main screen while projecting a movie.
* Changed MAX_OPACITY to 1.0 to obtain pitch black screen.
Revision 63 from original code: http://svn.cocoasourcecode.com/Shady