derivedFields particleDensity openPMD unit_SI=1

[PrometheusPi]

When using the particle density derived field (via PICMI), the stored mesh in the openPMD file has a unit_SI conversion factor of 1.0.
The values seem to be correct, but it is slightly confusing why this mesh is outputted in SI units and not in the PIC units as all other meshes.

[chillenzer]

Units are not yet correctly set and supported by our PICMI interface. That's on my todo list.