ECOG A Double-blind; Randomized; Placebo-Controlled Phase III Trial of Carboplatin; Paclitaxel and Sorafenib Versus Carboplatin; Paclitaxel and Placebo in Patients with Unresectable Locally Advanced or Stage IV Melanoma Adult CIRB - Late Phase Emphasis Closed to Accrual. Pts Have Completed Intervention Available to Open