create Two Part Tree Tuple
fun createTwoPartTreeTuple(left: A_Tuple, right: A_Tuple, newLevel: Int, newHashOrZero: Int): AvailObject
Create a 2-child tree tuple at the specified level. The children must both be at newLevel - 1. Neither may be empty.
Return
A new tree tuple at newLevel.
Parameters
left
The left child.
right
The right child.
new Level
The level at which to create a new node.
new Hash Or Zero
The new hash, or zero if inconvenient to produce.