from mantis: 474

I am pleased to announce a testable/tested incarnation of the 
millisecond clock implementation. It i faster too. This handles the 
millisecond clock rollover, and midnight rollovers.

If the clock is not used for a number of days and may have lost 
synchronisation then a sanity check is performed that will recalculate 
the offsets.

Files
1. DateAndTimeTest-testReadFrom.st
2. ClassClonerTestResource.st - for safely testing class side behaviour
3. DateAndTimeClockTest.st
4. Improve Date And Time.2.cs

Keith
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