It’s the head-butt that stops the nation. Tony Abbott is nutted by Astro Funknukl Labe, a 38 year-old North Hobart DJ. Labe, a barista, bartender and post-punk anarchist who bears more than a passing resemblance to The Young Ones’ Vyvyan Basterd, pretends to shake the former PM’s hand Thursday afternoon. Then he head-butts him. All…