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Changes
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0.4 (2008-09-08)
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- Moved InstrumentedSet to use BTree data structures for better performance.

- Added `update` method to InstrumentedSet.

- Updated documentation.


0.3 (2008-04-22)
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- Added a `set` implementation for referencing collections of objects.

0.2 (2007-12-21)
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- Extended the API for `IReferenceTarget.is_referenced` to allow specifying
  whether to query for references recursively or only on a specific object.
  By default the query is recursive. 

- Fixed bug in the event handler for enforcing ensured constraints: referenced
  objects could be deleted if they were deleted together with a parent
  location.

0.1 (2007-12-20)
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Initial release.
