The CHQ building in central Dublin is generally quiet of a morning, but early on June 14 last a long queue formed along its central aisle. The people were mostly young or middle-aged, and there were quite a few tourists. So what had them waiting patiently in line that Tuesday morning – concert tickets? A rental property to view? A celebrity book signing? Actually they were queuing up to buy whiskey, costing €120 a bottle. “Some had driven up from Limerick, just to be sure they could get it,” recalls Peter Dunne, a director of Mitchell & Son, outside whose…