This object holds all of the grid search, zooming grid search, and minimisation settings. It
provides the add_grid() and add_min() methods to allow the user to add successive iterations of
optimisation and settings to the object. The loop_grid() and loop_min() methods are used to loop
over each iteration of each method. And the get_grid_inc(), get_grid_num_int_pts(),
get_grid_zoom_level(), get_min_algor(), get_min_func_tol() and get_min_num_int_pts() methods are
used to access the user defined settings.
The auto-analysis has been redesigned around this new concept. All of the optimisation arguments
have been replaced. Instead there are the opt_rigid, opt_subset, opt_full, and opt_mc arguments
which are expected to be instances of the Optimisation_settings object. The optimisation in the
auto-analysis is now more advanced in that more user optimisation settings are now available and
active.
