standardizeNode: Standardize Node
In SWS-Methodology/faoswsAupus: Package to perform the AUPUS calculation.

Standardization follows the below process:

Compute a matrix ("reverseMatrix" in the code) describing how much of a particular quantity is passed from a child to it's parent. The (i,j)-th entry of this matrix specifies a conversion factor for transferring element j quantities into element i quantities.
Compute the matrix of required elements (column) for each commodity (row), and call this "valueMatrix".
Compute the new value for each commodity by pre-multiplying valueMatrix by reverseMatrix and therefore aggregating children commodities into their parents.
Lastly, save this new data back to the passed graph object, and return.

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standardizeNode(graph, workingNode, standardizeElement,
  productionElement = paste0(aupusParam$keyNames$valuePrefix,
  aupusParam$keyNames$elementName, "_51"))

`graph`	The graph object created by the function constructGraph.
`workingNode`	The nodes to be standardized
`standardizeElement`	The attribute of the nodes to be standardized.
`productionElement`	The column name of the production element in the nodes of the graph. Important if standardizeProduction = FALSE.