Dev mode controlled by config setting - when on, show a "system maintenance" message, unless logged in as administrator; allow login to administrators only (so allow access to the login form and login process, but error if the user isn't an administrator).
Dev mode controlled by config setting - when on, show a "system maintenance" message, unless logged in as administrator; allow login to administrators only (so allow access to the login form and login process, but error if the user isn't an administrator).