Thicket postprocessing

[pearce8]

We will use Thicket for postprocessing performance results.

• [x] Caliper modifiers. Caliper modifier "mode" determines what data is available in the .cali files after the run.
• [X] Python (not ipython) script for "Canned" stacked plots in Thicket for "Plain" Caliper modifier
• [ ] Propagate experiment info to Caliper; strong/weak use MPI ranks on x-axis, throughput uses problem size
• [ ] Add Caliper modifier for "Plain" + MPI; stacked plots should work for this as well
• [ ] Add mechanism to archive .cali files, trigger Thicket python script, post data on a dashboard