The war is over at CBS. Shari Redstone has emerged as the winner, while ally-turned-rival Les Moonves has been shown the door. And that CBS-Viacom reunion? It could be back on the table. Redstone and the now-former CBS chief executive clashed over who calls the shots – a power struggle that was teed up for a trial next month. The backdrop: a breakdown in negotiations aimed at reuniting CBS with its erstwhile corporate sibling, Viacom. The Redstone family business, Norwood-based National Amusements Inc., holds controlling stakes in both companies.