Note also needs --enable-compiler-warnings=yes and --disable-vec and isn't known to run!

Unlink all the saved files before creating new ones. Avoids issues if the saves fail and we could potentially have three restarts present in various forms.

Fix issue with attempt to dump partition when not using MPI

Can also change the number of queues to match the threads (expected behaviour), the number of tasks per cell and the size of MPI messages, these all could be useful when re-starting

The lenghts are checked against the expected values and cause an error, the labels are not currently used (would need to add API to return the headers so that these could be speculatively queried and the stream rolled back, so maybe not a great idea).

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

Needed to save and restore the current partition

Don't have any cells yet

Moved restart_write into engine_step and trigger after drift_all

Tidies up the restart option

Unify the first initialisation of the part and xpart arrays. Correctly set the ti_drift and ti_kick for gparts and sparts.

Better function name for the first initialiation of all the parts at the very start of engine_init_particles()

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.

This reverts commit d6acb7a1.

Meant to add to another branch...