These 3 packages should be loaded (or, more likely, merged) into current
Trunk for testing.  They all reside in the Inbox currently

  Kernel-cbc.872.mcz
  Collections-cbc.582.mcz
  KernelTests-cbc.278.mcz

They should have no collision with the current packages in Trunk.  They
shouldn't cause any problems with any code currently relying on how
DateAndTime and Timespan classes interact with Duration classes.

And they don't currently make any changes on the assumptions as to how
adding strings, time, DateAndTimes, Timespans, and Numbers to DateAndTime
and Timespan works today.  I'd like to make changing those assumptions a
difference activity than adding in the ability to add months and years to
dates.

This latest change adds #hash and comments to the GenericDurations.  It
also simplifies how GenericDuration works.

Thanks,
-cbc
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