DhruvZ

octree total gas masses improperly inversely scaling with nref

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### Bug report **yt (gas) octree smoothing does not conserve mass, and the discrepancy from the true particle mass total seems to scale inversely proportional to nref. This test uses...

As an additional option, it might make sense to have powderday pull the black hole accretion rate directly from the simulation (for those that have black holes) rather than just...