parse PSO and LMA parameters only once in run_fit_rel instead of n_trials

[martamatos]

parse PSO and LMA parameters only once in run_fit_rel instead of n_trials

[martamatos]

in particular, it's the load_load_enzyme_data that runs in every pso trial and lma run for no reason, because the data is always the same in different trials - so it should be loaded at the beginning