Cleanup test

- Remove unrelated/trivial comments
- Remove extra empty lines
- Follow Nexedi coding style (spacing, word-wrap)
- Merge use-once code
- Factorise many attribute accesses
- Stop testing newContent
- Replace len(foo.objectValues()) by len(foo)
- Factorise some duplicate "magic values"
- Merge uselesly splitted steps (and provide backward compatibility)
- Use full step names in sequence, for easier lookups


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@39006 20353a03-c40f-0410-a6d1-a30d3c3de9de