Create bobura::load_save_traits #72
Change the template parameters of bobura::load_save::load_from_file #72
Change the template parameters of bobura::load_save::* #72
Change the template parameters of bobura::command::load_from_file #72
Change the template parameters of bobura::command::new_file #72
Change the template parameters of bobura::command::save_to_file #72