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create_edge ({direction})

     Usage: Splits the current TILED window in half, creating a new
            window. Use move_edge to size the new window. The call
            will fail if there is not enough room for one line of text
            and the title (14 chars). The new window becomes current,
            and both the old and new windows will contain the current
            buffer.

Parameters: Direction .int. tells where to create the new window:
                        0 = above
                        1 = right
                        2 = below
                        3 = left
            If omitted, the user is prompted for an arrow key to
            indicate direction.

   Returns: 1 for success, -1 for failure.