Can now repartition at any time provided some fixed costs have been set.

Now we have ticks all the time the statistics and fixed costs estimates can be permanently available

Switch costs to time based, rather than some arbitrary scaling, makes comparisons more straight-forward

Also adds new task dumps with basic stats of the tasks and a .h form suitable for inclusion in partition.c

Use the same naming convention for the hydro sort activation function and the star sort activation function.

Add some implicit tasks to walk the tree up and down after the multipole initialisation and before the downpass.

Matthieu Schaller authored May 23, 2018 and Matthieu Schaller committed Jun 18, 2018

Extract the mesh gravity forces to a separate set of functions. Get the forces directly from the mesh to the gparts. Do not use the tree here.

Re-introduce the 'end_force' function as a task in order for the cooling function to be called at the right place in the time-step.

Made the ghost_in and ghost_out a separate task type to stop the confusion of the ghost being sometimes implicit.