{% comment %} Displays links to varieties of a page, each one for a different kind of item (tweet, favorite tweet, photo, etc). Expects: * variety_counts -- A list of dicts, each dict with 'count', 'app_name', 'app_slug', 'variety_name' and 'variety_slug' elements. * ditto_app_name -- eg 'twitter' or 'flickr'. * ditto_variety_name -- eg 'tweets' or 'favorites'. And one of: * day -- If this is the Day Archive page, the date we're viewing. * tag_slug -- If this is the Tag page we're viewing. {% endcomment %}