Change Set:		timespanZeroDuration-brp
Date:			23 September 2004
Author:		Brent Pinkney

The problem was identified by Ingo Hohman.

Added two new tests:
	TimespanTest>>#testZeroDuration
	TimespanTest>>#testClockPrecision

A fix was added to Timespan>>#end

Note. A time span of zero duration is equivalent to a time span of  
duration equal to the clock precision (DateAndTime>>#clockPrecision).

A more complete enhancement to remove the #end ambiguity will follow in   
in 3.8 I promise.

Brent
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