function makeXmlSlideLayoutRel(layoutNumber) {
		return gObjPptxGenerators.slideObjectRelationsToXml(
			gObjPptx.slideLayouts[layoutNumber - 1],
			[{
				target:"../slideMasters/slideMaster1.xml", type:"http://schemas.openxmlformats.org/officeDocument/2006/relationships/slideMaster"
			}]
		);
	}
Generates XML string for a slide layout relation file.
@param {Number} layoutNumber - 1-indexed number of a layout that relations are generated for
@return {String} complete XML string ready to be saved as a file