This is for both Monte Carlo and Bootstrap simulation. The simulation RDC and PCS values, as well
as the simulation back calculated values are now stored via the minimise_bc_data() function of
specific_analyses.n_state_model.optimisation in the respective spin or interatomic data containers.
The analysis specific API methods now send the sim_index value into minimise_bc_data(), as well as
the pipe_control.rdc.q_factors() and pipe_control.pcs.q_factors() functions.
