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