speciation Analysis tool to compute the speciation in molten salts Examples of use: Salanne, Simon, Turq, Madden, J. Phys. Chem. B, 111, 4678-4684 (2007) Machado, Zanghi, Salanne, Stabrowski, Bessada, J. Phys. Chem. C, 122, 21807-21816 (2018)