Plot tweaks
Bring back finding nearby halos, but better!
Points are assigned to halos if they are within the virial radius, and
if within multiple halos virial radii, to the largest one.
Save sigmaDLA to file and load again, as it can be a bit slow to generate
Bring back a power law fit
Plot tweaks
Do not attempt to load from the file unless reload_file is set
Plot tweaks
Remove DLA data which is going to its own repo
Plot metallicity in log units