Bug 183919 [Enhancement] add a switch to determine whether to clean viewer image folder when session expires
in current viewer implementation, file in image folder is deleted when its corresponding session expires, could viewer add a switch to allow users to decide whether this deletion operation should be performed.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/context/ViewerAttributeBean.java
public ParameterDefinition findParameterDefinition( String paramName )
	{
		return BirtUtility.findParameterDefinition( this.parameterDefList,
				paramName );
	}
	/**
	 * Returns the report title
	 * 
	 * @see org.eclipse.birt.report.context.BaseAttributeBean#getReportTitle()
	 */
	public String getReportTitle( ) throws ReportServiceException
	{
		String title = BirtUtility.getTitleFromDesign( reportDesignHandle );
		if ( title == null || title.trim( ).length( ) <= 0 )
			title = reportTitle;
		return title;
	}
	/**
	 * @return the maxRows
	 */
	public int getMaxRows( )
	{
		return maxRows;
	}
	/**
	 * @return the parametersAsString
	 */
	public Map getParametersAsString( )
	{
		return parametersAsString;