Bug 150347 Support binary stream as preview image.
See 144843. We need model to save binary strame as report preview image. Currently, preview image is an external image. Maybe need a type to distinguish preview image type.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ReportDesignHandle.java
implements
			IReportDesignModel
{
	/**
	 * Constructs a handle with the given design. The application generally does
	 * not create handles directly. Instead, it uses one of the navigation
	 * methods available on other element handles.
	 * 
	 * @param design
	 *            the report design
	 */
	public ReportDesignHandle( ReportDesign design )
	{
		super( design );
	}
	/**