bench.ocamllabs.io: way to sort the comparison data by slowest to fastest speedup

[ctk21]

It would be useful to be able to sort the comparison data over all benchmarks to list them by speedup/slowdown.

One option is to make the javascript graphs sortable.

An alternative option is to output an HTML table of benchmark_name x executable_normalized_value
which can then be sorted independent of the javascript bar chart.