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Correct use of caches in the self-PP gravity task. Make sure we can run without vectorization. Make sure we can run without hydro.

Lots of refactoring to tidyup code reuse

runner_dopair_grav() should abort if the distance between the cells is larger than the mesh smoothing scale.

convert engine_make_self_gravity_tasks to use a threadpool_map. still have to create the grav_ghost tasks sequentially, but i think that's ok since there are 128 times fewer of them.

engine_launch is only ever called with all threads, remove the option to limit the number of running threads.

Keeps the memory use down

In engine_marktask() only check whether to rebuild the space for density pair/sub-pair, not for all sub-types of pair/sub-pair.

In engine_marktask() only check whether to rebuild the space for density pair/sub-pair, not for all sub-types of pair/sub-pair.

Make sure that a repartition type of none does nothing, including triggering side effects like drift-all each step

Create the gravity pair tasks over the periodic boundary conditions. Make the long-range gravity task loop over the cells even over the periodic boundaries.

engine_launch is only ever called with all threads, remove the option to limit the number of running threads.

convert engine_make_self_gravity_tasks to use a threadpool_map. still have to create the grav_ghost tasks sequentially, but i think that's ok since there are 128 times fewer of them.

This reverts merge request !375