the joiningfile is now made by whichever job gets to this task first, so the error where it wasn't fully made (when jobs were slowly run from the HPC queue) should not happen now unless it takes a long time to write that one short file. I guess we could put in a checkfile if required, but this should be *very* rare.

fix some bugs in restarting from snapshots: the start_at was calculated incorrectly (needed to take into account modulo and previous start_at)

all other files access the HPC API, not the slurm and condor objects directly

cleaned up the evolve function so the option to join is selected before it is called, and this now has its own function

fix a few typos in the units

set up json functions to not convert ascii (should be faster and preserve UTF8)

Slurm restarts work, just take your old (unfinished) Slurm dir and set it with slurm_restart_dir=<whatever>

doesn't work for slurm yet, but small steps

also fixed a bug in keys_to_floats()

add CPU time to metadata output, and fix an issue with a tuple rather than a string from platform.something()