Be Gentle - its my first submission and the first bit of Smalltalk I've 
done in years.

This is basically David T Lewis's TimeZoneDatabase stuff with some 
extra support for prompting the user to select a timezone and extra 
logic that only loads all the timezones when the user is prompted to 
select a timezone.  Otherwise it only keeps two zones in memory - yours 
and the Zulu zone.  In addition, there is a bunch of glue that consists 
of:

* Added ISO 8601 read and write support to Date and Time.
* This package also includes a modified version of the TimeStamp class 
that comes with SqueakMap.  The new TimeStamp has been gutted and made 
timezone aware.  It is entirely implemented in terms of PointInTime.  
Thus, if you change your timezone, all of your timestamps will update 
accordingly.

TimeStamp also has support for reading/writing ISO 8601 format 
timestamps and consequently it is now safe to compare timestamps that 
were generated on different machines because they all reference the 
same base time.

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