Add a new parameter to the gravity calculation to control the frequency of the tree rebuild using a fraction of the number of gpart updates.

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

Read the minimally allowed temperature from the parameter file and convert it to a minimal internal energy per unit mass.

Exits the application and writes restart files (regardless of other settings)

Sugar of various kinds, new parameters to control restart file dumping, better adherence to the restart_ name space, dumps on exit for testing restarts, include in step properties

Make restart files dump after a number of hours from the start and synchronize dumps across MPI ranks

Start reorganizing so we can restart, doesn't work yet

Add the possibility to read basic chemistry information from the parameter file and propagate this onto the particle at initialisation time. More uniform naming convention for the first initialisation of properties.

Better naming convention for the cell_split variables in the YAML file. New variable for the splitting of gravity pairs.

Naming was getting messy, so adopt a more obvious scheme of vertex/edge descriptions