gint psppire_dict_get_next_value_idx (const PsppireDict *dict);
gboolean psppire_dict_rename_var (PsppireDict *dict, struct variable *v,
gint psppire_dict_get_next_value_idx (const PsppireDict *dict);
gboolean psppire_dict_rename_var (PsppireDict *dict, struct variable *v,