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Add/remove users or change their settings.
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Add a user:
  USER + <handle> <*|channel> <nick|mask> <level> [password]
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Remove a user:
  USER - <handle>
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Change a users level:
  USER <handle> +<newlevel>
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Add/remove a channel:
  USER <handle> +chan #channel
  USER <handle> -chan #channel
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Add/remove a host mask:
  USER <handle> +host *!*my@*example.com
  USER <handle> -host *!*my@*example.com
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Only one channel or one mask can be modified with each USER command.
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Prefix flags with a "-" to disable them or a "+" to enable them.
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User flags:
  AO         auto-op on/off
  AV         auto-voice on/off
  BNC        enable a user to use the bouncer feature
  ECHO       partyline echo on/off
  P<level>   change protection level (0-4)
             If disabling (-P), level is not needed.

Botnet user flags:
  NS         not shared, user is not set to botnet but may be
             overwritten by incoming shares
  RO         read only, user is not overwritten by incoming shares
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Example: USER owner +ao -av
  Enables user autoop and disables autovoice for user "owner".
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See also: protection, userlist, setaop, setavoice, setprot
