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/writer/IndentableXMLWriter.java
String indent = ""; 
		if ( cachedIndents.size( ) == 0 )
		{
			cachedIndents.add( indent );
		}
		else if ( cachedIndents.size( ) <= level )
		{
			indent = (String) cachedIndents.get( cachedIndents.size( ) - 1 );
			indent += TAB;
			cachedIndents.add( indent );
		}
		else
		{
			indent = (String) cachedIndents.get( level );
		}
		return indent;
	}
	/**
	 * Returns tabs for the current element.
	 * 
	 * @return the indents for the current XML element.
	 */
	private String getCurElementIndent( )
	{
		if ( cachedIndents.size( ) == 0 )
			return ""; 
		String indent = (String) cachedIndents.get( elementStack.size( ) - 1 );
		return indent;
	}
	/**