Separate the time-step information for hydro and gravity tasks into two different set of variables for each cell.

Sort out naming of output cell dumps to be based on the step, so they can be compared to other dumps

Sort out naming of output cell dumps to be based on the step, so they can be compared to other dumps

Make dumpCells function dump all locally active cells and perform a careful task count when SWIFT_DEBUG_CHECKS is defined

Also check that all particles are in the correct cell at all levels when checking for h_max and dx_max

Useful to visualize the partition

Wrote 1D Voronoi cell generation algorithm and corresponding unit test. Algorithm is not coupled into swift yet.

Added GIZMO_SPH option in const.h. Made sure the resulting code compiles. It probably does not work correctly though.