Changes for version 0.19
- Patch sub intersection() to assign the result to the object, before returning. This means that in situ updates of the object now work. Many thanx to Helmut of hzlabs (de) for reporting this problem.
- Add 3 new tests (44 .. 46) to protect against regressions.
- Rename Changes.txt to CHANGES.
- Set::Array - Arrays as objects with lots of handy methods (including Set comparisons) and support for method chaining.