By Emma Berry and Brian Sheerin NEWMARKET, UK -- As the sun went down, the ring filled up and, after the odd false start, the sale-watchers got what they came for: Porta Fortuna, followed by Tamfana, Barnavara, Saqqara Sands and then some as an array of equine jewels combined to bring the highest gross ever recorded in a single day in European auction history. If many had predicted that Porta Fortuna (Caravaggio) would top the sale then they were almost right, and for about an hour she held the record...