Misleading output from speed benchmarks

[Roger-Shepherd]

The speed benchmark can produce both "speed" results (time taken by reference/time taken by current) and "absolute" results (time taken by current). In both cases the output gets labelled as "speed" which is misleading when the "absolute" figure is time which means 1/time. It would be straightforward to change the output to say "Time" for absolute values but there may be consequences in software that uses the "speed" results.