Removed support for the defunct option to run VELOCIraptor every fixed number of steps rather than at a fixed time.

Make all the EAGLE examples run with gravity, cosmology and stars switched on. Make them dump more snapshots.

Improve the way we define the time of the first snapshot and statistics in cosmology and non-cosmology modes.

Switch on cosmological time integration in the example run scripts of the EAGLE_* cases. Also switch on the cleaning-up of the h-factors in the ICs.

Added a parameter to the gravity properties to contain the distance below which all computed forces are Newtonian