added AtariObserver and updated CaptureSuggester to use it.
Using CaptureSuggester in PlayoutSpeed.
Board now notifies observers after a pass.
Collapsed an else in AtariObserver.
Improved efficiency of AtariObserver.
Board no longer maintains a set of chains.
BoardObservers can now all copyDataFrom.
Board can now copy data from another board.
Alphabetized methods in Board.