Custom Handlers for Listers: reread

The reread event will be sent to your handler when the Re-read Directory
item is chosen from the lister cache pop-up menu.

Its arguments are:-

        Arg0 - "reread"            (a string indicating the event type)
        Arg1 - <handle>            (lister handle)
        Arg2 - <path>              (new path for lister)