Minor change in 'vos_user' man page.

       the VOSpace Transfer Service automatically populates the 'users' table in the database

       by previously quering the authentication system (RAP).

       It also adds the user node in the 'node' table, if not present (e.g. '/john.smith' for 

       the user 'john.smith').

       So, please, use this client only if you need to handle situations involing users that

       for some reason are not recognized by the authentication system.

       the user 'john.smith'). You can use this client to register a user manually, as needed.

       For all other cases, please, use this client only if you need to handle situations

       involving users that for some reason are not recognized by the authentication system.

    """)

# Create new VOSUser object