Forbid to change username
Add an server wide option to forbid renaming user names. It might be a security problem, if someone claims abandoned user name (/account name).
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 Sedrubal
    
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Sedrubal
    
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      Aki commented I also want this very much! 
 A username sometimes links to other IDs like a worker's ID in order to patch user information, so this need can be met with that option.
