Stop "sit user name" and "stand user name" console commands from trying to sit/stand avatars already sitting/standing
In pCampbot, don't try and reconnect bots that are already connected on console "connect" command
Stop error messages being misleadingly generated when on client connection activity timeout, a root connection triggers a CloseAgent to a neighbour region which has already closed the agent due to inactivity.

Also separates out log messages to distinguish between close not finding an agent and wrong auth token, and downgrades former to debug and latter to warn
Stop "handle sit user name" command from trying to sit avatars on objects which have sit positions but are attachments
Add "set bots" command to make it possible to set SEND_AGENT_UPDATES on all bots whilst pCampbot is running