From the preamble:

Date:			29 April 2001
Author:			Andrew P. Black

Added an instance variable and associated logic and menu item to 
control whether the display of the clock should be in 24 hr mode or 
am/pm mode.  The default is still am/pm mode.  Maybe there should be 
a preference for this?
Also did some method categorization, and added a class comment.
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