anchor.diff:  
   /**
     * Called when the atom log's in or out
  -  * 
  +  *
     * Default behaviour is to call on_log on the location this atom is in
     */
   /atom/proc/on_log(login)
  
positive.code: /atom/proc/CanPass(atom/movable/mover, turf/target)
  	return !density
  
  /** 
    * Is this atom currently located on centcom
    * 
    * Specifically, is it on the z level and within the centcom areas
    * 
    * You can also be in a shuttleshuttle during endgame transit
    *
    * Used in gamemode to identify mobs who have escaped and for some other areas of the code
  
negative.code:   *
    * This behaviour is usually to mass transfer, but this is no longer a used proc as it just
    * calls the underyling /datum/component/storage dump act if a component exists
    *
    * TODO these should be purely component items that intercept the atom clicks higher in the
    * call chain
    */
  