Minimum version: Midgard 1.4 (Bifrost)
Sets the sitegroup a record belongs to. A call to this function will fail if caller is not authenticated as root.
Returns true if succesfull. Returns false on failure.
Method available for: article, attachment, element, event, event_member, group, host, member, page, pageelement, pagelink, person, preference, snippet, snippetdir, style and topic records.