Regression: newly created users can't be used

When you create a new user, you are no longer able to login as that user. What happens is that the credentials record that's generated has the password hash and salt, but not the username – so the subsequent login operation can't find a match for the username/password.

I think this most likely arises from changes in the structure of the new/edit user form (UIU-282), causing the userdata object that gets passed to the create function in Users.js to have a slightly different structure.

I'll look into this. (I can't really push on with the UIU-303 work until it's resolved.)