reproducibility: sort surf source bank before write #2500
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If you look at the code where we load particles into the surface source bank (
Particle::cross_surface), you'll see that we probably should be sorting this bank before writing in order to ensure the same output file is produced each time without regard to the order threads run in. It appears that this race condition caused unlucky CI failure for @cfichtlscherer, so if he can rebase on this and pass CI, we should definitely merge this tiny change.