EP2986609B1 - Pharmaceutical Formulations, Processes, Solid Forms and Methods of Use Relating to 1-Ethyl-7-(2-Methyl-6-(1h-1,2,4-Triazol-3-Yl) Pyridin-3-Yl) -3,4-Dihydropyrazino[2,3-B]pyrazin-2(1h)-One