origCollection.readXML(newFilename, this.project);
newCollection.readXML(newFilename, this.project);
	public UnionResults(String origFilename, String newFilename) throws IOException, DocumentException {		this(new SortedBugCollection(), new SortedBugCollection(), new Project());		origCollection.readXML(origFilename, new Project());		origCollection.readXML(newFilename, this.project);	}