Multiple foreign functions in the reinitialize-instance for mobjects
It is now possible to specify two foreign functions for the reinitialize-instance for defmobject. The switch between the function depends on the presence or absence of optional/key arguments. This is used in the definition of one-dimensional-minimizer to switch between gsl_min_fminimizer_set and gsl_min_fminimizer_set_with_values depending on the non-NIL value of f-minimum. The set-with-values case has not yet been tested.
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