auc / addusercommand          Adds a new user command
 
   Format:
      ;auc <standard_command> <user_command> 
               Adds a new user command corresponding to a client command
 
   Notes:
      All client commands have a single standard form (for example, this
         command's standard form is 'addusercommand').
      Some of the standard forms for client commands are quite long, so Axmud
         allows the user to create abbreviated versions called 'user commands'.
      Each client command already has one or more user commands by default. The
         user commands for this command are listed below. One of them is 
         identical to the standard form of the client command.

      Now, whenever you type a client command in the 'main' window, what you're 
          actually typing is a user command. Axmud translates this into the 
          standard form of the corresponding client command before executing it.
      User commands must be no longer than 32 characters, contain only A-Z, a-z, 
         underlines and 0-9 (not the first character) and not be one of Axmud's 
         reserved names (see the ';listreserved' command). Non-Latin alphabets
         are acceptable.
      You can't add a user command which is already in use by another standard
         command.
 
   User commands:
      auc / adduc / addusercmd / addusercommand
