4 * Default theme implementation to display a single views grouping.
7 * - view: The view object.
8 * - grouping: The grouping instruction.
9 * - grouping_level: A number indicating the hierarchical level of the grouping.
10 * - title: The group heading.
11 * - content: The content to be grouped.
12 * - rows: The rows returned from the view.
14 * @see template_preprocess_views_view_grouping()