Fixed typo.

       Adding a user to the database requires a user ID, a username and an e-mail address.

       A valid userID is required when deleting a user from the database.

       IMPORTANT NOTE:

       IMPORTANT NOTES:

       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 on the 'node' table, if not present (e.g. '/john.smith' for 

       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.