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.