Job Stats: Show the average task run time, job duration and cost

It would be nice to extend the current job statistics to include the average run time, including min/max. It could be displayed as a number somewhere, and also draw a line on the graph.

It would also be really useful to include the following:

Total task run time - sum of all task durations
Total job run time - Job start and terminate delta
Cost for average task
Cost for Job

I've been using it a lot for benchmarking and always need to manually add the other bits. This would really make it a one-stop-shop for benchmarking.