void active_set_change(const SpVectorSlice &nu_k, const SpVectorSlice &nu_km1, Range1D indep, EJournalOutputLevel olevel, std::ostream *out, size_type *num_adds, size_type *num_drops, size_type *num_active_indep, size_type *num_adds_indep, size_type *num_drops_indep)
Calculate the change in the active set and output change if asked to.