Bug 199360 Provide new servlet to retrieve html fragment when in reportlet mode
Currently in reportlet mode, the framesset servlet will still wrap and return all ajax viewer code. We need a new servlet to return only html fragment generated by engine. Then this fragment can be further parsed by client side according to user's requirement.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/context/BaseAttributeBean.java
{
	/**
	 * Identify the incoming request category.
	 */
	protected String category;
	/**
	 * Need to store the exception.
	 */
	protected Exception exception = null;
	/**
	 * Get report parameters passed in by URL.
	 */
	protected HashMap parameters = null;
	/**
	 * Whether missing parameters.
	 */
	protected boolean missingParameter = false;
	/**
	 * scalar parameter bean.
	 */
	protected ParameterAttributeBean parameterBean = null;
	/**
	 * Viewer report design handle
	 */
	protected IViewerReportDesignHandle reportDesignHandle = null;