addSibling: Add a sibling to the current node.
Description
Add a sibling to the current node.
Usage
addSibling(self, private, id, data)
Arguments
self
The point in the tree where the sibling should be added.
private
The private part of the tree.
id
The id of the node that should be added.
data
The data of the node that should be added.
Value
invisible the new node that was created.