Push the cooling task to a lower level to gain more parallelism in the case of GRACKLE cooling for instance.

Update the forced multipole reconstruction to do the exact same thing as the tree-rebuild 'natural' multipoles

More sensible abort condition in cell_add_gpart() cell_add_spart(). Add check to prevent users from running with SF but no spare stars

Allow M2L on cells with size 1. Symmetries correctly the long-range task and the task creation loop.

Fix the time-step debugging check for the rare case where a BH has swallowed the particle with the smallest time-bin in a cell.

Only check the correctness of hydro time-steps in cell_check_timesteps() if there are hydro particles in the cell.

Need to distinguish the kicks in the timestep_limiter as some particles may be kicked anyway by the kick1 task.