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** of the page straight up to this node.
** mo: "merge-out". If non-zero, this is one more than the x-coordinate
** for the upward portion of a merge arrow. The merge arrow goes up
** to the row identified by mu:. If this value is zero then
** node has no merge children and no merge-out line is drawn.
** mu: The id of the row which is the top of the merge-out arrow.
** u: Draw a thick child-line out of the top of this node and up to
** the node with an id equal to this value. 0 if there is no
** thick-line riser.
** the node with an id equal to this value. 0 if it is straight to
** the top of the page, -1 if there is no thick-line riser.
** f: 0x01: a leaf node.
** au: An array of integers that define thick-line risers for branches.
** The integers are in pairs. For each pair, the first integer is
** is the rail on which the riser should run and the second integer
** is the id of the node upto which the riser should run.
** mi: "merge-in". An array of integer x-coordinates from which
** merge arrows should be drawn into this node. If the value is
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