The first 10.7.0 build i tried used hyphens, but a later one didn't.
emails.json can now be converted between the two forms depending on what
the server uses.
Hyphens are added to user IDs from 10.7.0, so if the server is running
it, emails.json will be modified to include them. The existing file is
backed up. Also, scss files have been simplified since bs4-jf and bs5-jf share
much of the same content.