N-body updated to 0.80
I've updated all the N-body applications to 0.80. These add a new kind of likelihood calculation (and soon validation method) we're probably going to switch to using that will allow adding GPU versions sometime in the near future (the GPU version is pretty much ready to go, but we need to fiddle with these kinds of issues first). Since the n-body is statistical, for any simulation the result can be anywhere in a distribution. So far for validation we have relied on the results from any 2 system being identical, but this is more problematic when you try to include GPUs. The new results should be "fuzzier" and more resistant to some other types potential problems the old likelihood calculation could have.