Working user admin page

This is the progressivly enhanced version of the user accounts page. It
uses javascript to update the users role, or alternatively remove them
from the instance entirely.
add legacy account upgrade so I can access it for dev
coded and styled static HTML upgrade account screen
added user controls header with styling
Add missing validation message for unknown user

When we don't have a user make sure a validation message is set to
prevent the server from crashing.