prettyunits-package prettyunits color_reference color_reference compute_bytes pretty_bytes compute_num pretty_num prettyunits prettyunits pretty_bytes pretty_bytes pretty_color pretty_color pretty_colour pretty_color pretty_dt pretty_dt pretty_ms pretty_ms pretty_num pretty_num pretty_p_value pretty_p_value pretty_round pretty_round pretty_sec pretty_sec pretty_signif pretty_signif time_ago time_ago vague_dt vague_dt