Bug 162281 Better parsing of BIRT_VIEWER_LOG_LEVEL parameter
java.util.logging.Level supplies a parse(String) method which parses log levels. Using this method is superior to the parsing used in ReportEngineServlet for the following reasons: - the level "ALL" is not recognized - one gets a proper exception if the level ins not recognized - a lot less code. I'll attach a patch for this.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/service/ReportEngineService.java
scriptlibClassPath += EngineConstants.PROPERTYSEPARATOR
					+ ( (File) jarFileList.get( i ) ).getAbsolutePath( );
		if ( scriptlibClassPath.startsWith( EngineConstants.PROPERTYSEPARATOR ) )
			scriptlibClassPath = scriptlibClassPath
					.substring( EngineConstants.PROPERTYSEPARATOR.length( ) );
		System.setProperty( EngineConstants.WEBAPP_CLASSPATH_KEY,
				scriptlibClassPath );
		config.setEngineHome( "" ); 
	}
	/**
	 * Get engine instance.
	 * 
	 * @return the single report engine service
	 */
	public static ReportEngineService getInstance( )
	{
		return instance;
	}
	/**
	 * Get engine instance.
	 * 
	 * @param servletConfig
	 * @throws BirtException
	 * 
	 */
	public synchronized static void initEngineInstance(
			ServletConfig servletConfig ) throws BirtException
	{
		if ( ReportEngineService.instance != null )
		{