[MERGE] Remove duplicated class definitions and remove unused imports from pack_repo.py

[Bundle Buggy]

Bundle Buggy has detected this merge request.

For details, see: 
http://bundlebuggy.aaronbentley.com/project/bzr/request/%3C20080805225218.GA19255%40steerpike.home.puzzling.org%3E
Project: Bazaar