Study TRX109011/TRX109013, A Randomized, Double-blind, Double-dummy, Placebo-controlled, Crossover Study to Evaluate the Efficacy of TREXIMET® (Sumatriptan + Naproxen Sodium) versus Butalbital-containing Combination Medications (BCM) for the Acute Treatment of Migraine when administered during the Moderate-Severe Pain Phase of the Migraine (Studies 1 and 2 of 2)