The CLI command nomad dev units
outputs a Javascript source file that is automatically created from the currently used Pint units. This command is also run in the Dockerfile.
I added a menu for choosing the units in the ArchiveBrowser. You can either select SI units, atomic units, or a custom selection for a selection of quantities. By default, a custom selection is used (eV instead of Joule, angstrom instead of meter, otherwise default SI units). This can be changed based on what we think is reasonable.