Changes since DRUPAL-6--2-3:
- #816776 by Soren Jones: better colours for plain, alternate and upanddown widgets.
- #968630: Let widgets modify template variables.
- bug #962996 by catch, marvil07: Avoid unnecessary queries in vud_widget_proxy().
- Added a permissions check to confirm whether the user viewing the
widget is allowed to vote or not before trying to look up their vote,
this saves 90 queries when viewing 90 comments showing the widget.
- Only query positives and negatives for upanddown widget.