Changes since DRUPAL-6--2-0:
- #876786 by albert1t0: Avoid undefined variable in hook_help().
- Wrong voting tag at vud_node hook_link
- feature request #67256 follow-up by catch, marvil07: revert sessions for anonymous for pressflow and use skip_anonymous flag at drupal_valid_token calls
- feature request #785344 by jcisio: Added CSS sprites for alternate and plain widgets.
- bug #815984 by mgifford, marvil07 | Cliff: Make widgets readable by screen readers.