Changes from previous:
----------------------
0.21 Wed Mar 28 14:34:18 2007
- Fix RT Tickets:
- 14535: Fix spanner clean() docs (reported by carbon at pobox.com).
- 25898: Undef dereference with empty object (patch by Adam Tomason).
- 30777: Add short_list_range() method (patch by Josef Kutej).
- 48308: clean() or list() before add() causes error (reported by David Cawley).
- 50042: spanner add() did not accept non-object (patch by Tomo.M).
- 52571: "::" not accepted as valid IPv6 address (reported by Tim Wilde).
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