Need a way to do setup/teardown outside of profiling

[cgay]

If a benchmark needs (for example) to create a temp file, there should be a way for it to do that and for the setup and teardown bits to happen outside of any performance measurements.

We could provide setup/teardown options for tests similar to those for suites, and run those outside of the profiling calls.

Or, provide a way to reset the profiling data back to zero. This would be more flexible, I suppose, but the setup/teardown feature would be nice to have for other reasons?