Change task order v2

See merge request !955

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

Fix parallel output

See merge request !953

Fix rounding error problem in the enrichment routines.

See merge request !949

Changed the name of the temperature delta criterion to an entropy delta criterion in the EAGLE model. Documented the delta and the pressures in the RTD.

Gravity dithering

Closes #497

See merge request !952

This reverts commit d26bf558.