Bug 187213 Provid a writer to serialize design in document without any white space.
Add a new writer for serialize design in document without any withe space.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/util/XMLWriter.java
{
	/**
	 * Line counter.
	 */
	private int lineCounter = 1;
	/**
	 * Control flag indicating whether need mark line number when writing.
	 */
	private boolean markLineNumber = true;
	/**
	 * The default output encoding is UTF-8.
	 */
	protected final static String OUTPUT_ENCODING = "UTF-8"; 
	/**
	 * The output stream.
	 */