DESTROY ALL

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DESTROY ALL

            DESTROY ALL

        Destroys all the plot, i.e. destroys all the top directories  and  their
        windows.

        Since  the user can not be in the root directory (<) and create segments
        in it, a new top directory and its first window are implicitely  created
        after this. DESTROY ALL is thus the way to reset the tree and windows to
        their startup status.