Copy io500.sh into results directory

[johnbent]

To easily track how tuning affects results when people are running io500 multiple times, it would be useful to copy io500.sh into the results directory.

„It would be helpful to alter the io500 code so that it places a copy of the io500.sh user modified script into the results directory. It makes it easier to track which version of the script was used. The main issue is that a lot of parameter tweaking can occur look for the best parameter set for the best io500 numbers. It is easy to lose track between runs which is which.“

[johnbent]

Idea from Greg Lehmann from CSIRO