Additional results to benchmark

[Joel Moberg]

I am bench-marking a parallel algorithm where I sacrificed some precision
for lower execution time. Now I would like to add a precision score to the
benchmark output. It seems that it is more convenient to add these results
and use same output. I am already using the output to plot results.

I have read the samples but can not find code that do this. Would it be
possible to pass a Result instance to a tear-down phase? In this way at
Level.Iteration, you can access IterationResult; at Trail, BenchmarkResult.

Please let me know what you think.

Best,
Joel