Revert P2/P3 changes

I'm not going to implement this the convoluted way the spec says.
Instead, I'm going to implement it the way the spec should have been
written...
Add isolates to neutrals
Implement isolates

Wow, it's almost perfect already!
Better isolates

Remove data from runs when done, so they can merge with eachother.
Down to 9 failures out of 497187 tests!
Update embedding invalid-accounting to new draft

Down to 6 errors.