Function: `XMLElemNew`

Creates a new XML Element which can be appended to an XML document

Method Signature

XMLElemNew(XML=[xml], childname=[string], namespace=[string])

Argument	Type	Required	Description
`XML`	`xml`	`true`	The parent XML object to associate the new node to
`childname`	`string`	`true`	The XML name of the new child node
`namespace`	`string`	`false`	The XML namespace to attach to the new child node