Show relative differences in the results table

[ionelmc]

Something like 25% (± 5%) faster.

I'd use these as the basis for implementation:

• http://www.cs.kent.ac.uk/pubs/2012/3233/content.pdf
• https://kar.kent.ac.uk/33611/7/paper.pdf
• https://github.com/softdevteam/libkalibera (http://soft-dev.org/src/libkalibera/)

However the formulas are designed for fixed number of rounds, so all tests need to be run same number of rounds. This is a bit of a problem because I have the --max-time limiting.

Other things to read:

• http://d3s.mff.cuni.cz/research/seminar/download/2006-09-05-Kalibera-RegressionBenchmarking.pdf
• https://en.wikipedia.org/wiki/Analysis_of_variance
• http://www.amazon.com/The-Computer-Systems-Performance-Analysis/dp/0471503363

[ltratt]

FYI, libkalibera has moved to github. The main page at http://soft-dev.org/src/libkalibera/ will always contain an up-to date link, so that's probably the best link.