ANN: set-0.2 module available

Located at http://bent-arrow.com/python and the Vaults of Parnassus. This extension module implements a set type, similar to PEP 218. Changes since version 0.1 include some bug fixes and the features below, based on feedback. - The set hashing function is no longer brain-dead. Thanks to Kevin Jacobs. - Set comparison has been better optimized. - Sets have two new (read&write) boolean attributes: 'mutable' and 'hashable'. At the risk of feature bloat, this should allow complete flexibility. The default is still the same: hashable and mutable, but becomes immutable upon first (successful) hashing. Thanks for the comments, -Coady