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move_edge ({direction}, {amount})

     Usage: Moves an edge between two TILED windows.

Parameters: Direction .int. specifies the edge to move:
                        0 = above
                        1 = right
                        2 = below
                        3 = left
            If omitted, the user is prompted for an arrow key to
            indicate direction. Amount .int. tells how far to move
            with respect to the upper left corner.  Negative means move
            toward it.

   Returns: Greater than 0 for success, 0 or less for failure.