change sort task flags to be zero by default and only switch on those that are needed, avoids pre-emptively computing all the sorts for a cell since they may never be needed between two sort cleanups.

Conflicts:
	src/engine.c
	src/runner.h
	src/runner_doiact.h
	src/scheduler.c

replace 'wait' with 'implicit' in scheduler_addtask, as we weren't using the former and could use the latter.

Disabled GIZMO particle steering for vacuum particles

I disabled particle steering for particles with zero density, as they have weird sound speeds that mess up the steering algorithm. This fixes #271.

See merge request !346

Disabled GIZMO particle steering for vacuum particles

I disabled particle steering for particles with zero density, as they have weird sound speeds that mess up the steering algorithm. This fixes #271.

See merge request !346

Update task dump processing

Fix some issues in autoranging, add new script to output simple stats
for pre-thread, step and rank. Add support for new drift_grav task.
Incorporate stats in higher-level processing scripts so that they
can be seen in the HTML pages.

See merge request !347

Add a colour to keep similarity to previous scheme

Disabled GIZMO particle steering for vacuum particles. Disabled warning messages for unphysical values and pathological configurations.

Correctly initialise the signal velocity of the SPH particles in the Minimal and Pressure-Entropy cases.

Implemented the changes in ls that prevent gizmo crashes in cases where the mesh is seriously distorted

Initialize the signal velocity to be the particle's sound-speed. Prevents divisions by zero in cases where a particle has 0 neighbours.

Updated plotting scripts for the hydrostatic halo case to be more SSH friendly and to read the correct parameters in the yaml file.

New addition to the test suite: A perturbed version of the 125 cells case



See merge request !341

Updated the scripts running the tests to actually crash if they fail at any iteration and not just on the last one. Code formatting. Do not compile the FFT functions if FFTW is not found.