SACRAMENTO An arbitrator has ruled that state officials miscalculated wages and benefits for corrections employees, a mistake that will cost California taxpayers an estimated $440 million over two years and force cuts to other state departments. The ruling, made public Friday, means the state will pay $200 million for back pay and health benefits to about 30,000 prison guards, probation officers and other correctional employees, retroactive to July 1, 2005. In addition, the employees are due a 3.1 percent pay increase retroactive to the start of the year under a provision that ties their wages to those of other law...