Static LatticeExprNode functions

The following table lists helper functions in LatticeExprNode and their uses for creating appropriate nodes in the tree.

LatticeExprNode	Reason
function
newNumUnary	Create a new node for a numerical unary operation.
	The result has the same data type as the input
newNumBinary	Create a new node for a numerical binary operator.
	The result has the same data type as the combined input type.
newBinaryCmp	Create a new node for a comparison binary operator.
	The result has the same data type as the combined input type.
newNumFunc1D	Create a new node for a numerical function with 1 argument.
	The result has the same data type as the input.
newRealFunc1D	Create a new node for a real numerical function with 1
	argument. The result has the same data type as the input.
newComplexFunc1D	Create a new node for a complex numerical function with 1
	argument. The result has the same data type as the input.
newNumReal1D	Create a new node for a real numerical function with 1
	argument. The resultant type is non-complex
newNumFunc2D	Create a new node for a numerical function with 2 arguments.
	The result has the same data type as the combined input type.