Function phyloalifold::get_ss_part_func_mats

pub fn get_ss_part_func_mats(
    seq: &[usize], 
    seq_len: usize, 
    invert_exp_max_free_energy: f64, 
    ss_free_energy_mats: &mut SsFreeEnergyMats
) -> SsPartFuncMats