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/ModuleWriter.java
{
		writer.startElement( DesignSchemaConstants.CELL_TAG );
		markLineNumber( obj );
		writer.attribute( DesignSchemaConstants.ID_ATTRIB, new Long( obj
				.getID( ) ).toString( ) );
		attribute( obj, DesignSchemaConstants.VIEW_ACTION_ATTRIB,
				IDesignElementModel.VIEW_ACTION_PROP );
		super.visitCell( obj );
		property( obj, ICellModel.COLUMN_PROP );
		property( obj, ICellModel.COL_SPAN_PROP );
		property( obj, ICellModel.ROW_SPAN_PROP );
		property( obj, ICellModel.DROP_PROP );
		property( obj, ICellModel.HEIGHT_PROP );
		property( obj, ICellModel.WIDTH_PROP );
		property( obj, IDesignElementModel.EVENT_HANDLER_CLASS_PROP );
		property( obj, ICellModel.ON_PREPARE_METHOD );
		property( obj, ICellModel.ON_CREATE_METHOD );
		property( obj, ICellModel.ON_RENDER_METHOD );
		writeUserPropertyDefns( obj );
		writeUserPropertyValues( obj );
		writeStyle( obj );
		writeContents( obj, ICellModel.CONTENT_SLOT, null );
		writer.endElement( );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.design.elements.DesignVisitor#visitGrid(org.eclipse.birt.report.model.design.elements.GridItem)
	 */
	public void visitGrid( GridItem obj )