population.should_stop(): New function, to enable going as far as possible in offline measurements
.mdat files: Store per-instance nfevs, not iterations (invocations)

We are moving to nfev-based policies and this is much more useful
information then, also the one more difficult (albeit possible) to
compute manually.
pptools/pfpickle.py: Fix loading parallel-evaluated algorithm data
pptools/table_final.py: Fix recently introduced bug that made counts totally haywire
pptools/table_final.py: Add support for rendering single-function columns
pptools/table_final.py: Use 0 instead of inf for proportions
pptools/table_final.py: Disable most debug prints