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Conflicts:
	src/hydro/Gadget2/hydro_iact.h
	src/vector.h

Conflicts:
	src/kernel_hydro.h

Use intrinsics for vector operations as arithmetic overloading is not supported by the Intel compiler yet for AVX-512 vectors.

Conflicts:
	src/hydro/Gadget2/hydro_iact.h

Use intrinsics for vector operations as arithmetic overloading is not supported by the Intel compiler yet. Updated masking operations with new macros so that AVX-512 masking is supported.

Conflicts:
	src/kernel_hydro.h

Conflicts:
	src/vector.h

Use intrinsics for vector operations as arithmetic overloading is not supported by the Intel compiler yet.

Updated version number to 0.6.0 to reflect the large number of changes to the threadpool, drifts, MPI and scaling performance in the last few months.

Periodic gravity speed and accuracy improvements



See merge request !393

Threadpoolize all the things

These are all the remaining function from the list in #338. I've tested this as far as possible on my laptop, i.e. MPI and gravity *should* work.

See merge request !384

Merge branch 'threadpoolize_all_the_things' of gitlab.cosma.dur.ac.uk:swift/swiftsim into threadpoolize_all_the_things

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 barrier

Following the results in the `threadpool_task_plots` branch, I've replaced the elaborate hand-crafted `engine_barrier` function by two `pthread_barrier`s.

As a result, the runner threads should all start, and synchronize, faster.

See merge request !386

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

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

Added the EAGLE_6 test case. This is a very small cosmological volume not representative of the workload of large runs.