Fix the stddev/mean computations which had be garbled since commit e5f5a0d30e91d94b0563a0c92bbc2a71b4361daa, leading to a mean that was not in the min/max range and to zero-divide in the stddev computation, among others.
Adding myself to the contributors
Print mean/stddev of the # of iterations.
Merge branch 'TwoBugs' into StatsPure
Less of a hack: avoid the division/multiplication if the stddev is 0.
Comment.
Merge pull request #25 from pleroy/StatsPure

Fix the stddev/mean computations