Bug 214204 Only document content in document folder should be removed.[0601]
Description: Only document related content in document folder should be removed. Build number:2.3.0.v20080103 Steps to reproduce: 1. Deploy BIRT. 2. Edit web.xml to set BIRT_VIEWER_DOCUMENT_FOLDER to your local path and there are content inside the path. 3. Start server and click View Example to preview sample report. Expected result: Only content created by viewer should be removed in specified document folder. Actual result: All contents are deleted despite whether they are related with BIRT. Error log:n/a
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/ParameterAccessor.java
* @param key
	 * @return
	 */
	public static String getInitProp( String key )
	{
		if ( initProps == null || key == null )
			return null;
		return (String) initProps.get( key );
	}
	/**
	 * Returns the extension name according to format
	 * 
	 * @param format
	 * @return
	 */
	public static String getExtensionName( String format )
	{
		if ( format == null )
			return null;
		String key = "viewer.extension." + format.replaceAll( " ", "_" ); 
		return DataUtil.trimString( getInitProp( key ) );
	}
	/**
	 * Returns the output format label name
	 * 
	 * @param format
	 * @return
	 */
	public static String getOutputFormatLabel( String format )
	{