Bug 185931 Support to distinguish the week between Year-Week and Month-Week[1101]
Description: In our OLAP builder, the datetime dimension is divided into YEAR-QUARTER-MONTH-WEEK-DAY. When select all the levels, the WEEK should be the week(1 to 5) in one MONTH When select YEAR-WEEK levels, the WEEK should be the week(1 to 52) in one YEAR But now in our OLAP builder, the WEEK only belong to the MONTH, But not belong to the year, so if only select the YEAR-WEEK level, the result of crosstab is meaningless. The YEAR-DAY, MONTH-DAY and WEEK-DAY also have the same issues. we should define a rule to make sure the WEEK has a correct relationship of his parent
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/DesignSession.java
* Opens a library with the given library file name.
	 * 
	 * @param systemId
	 *            the uri where to find the relative sources for the library.
	 *            This url is treated as an absolute directory.
	 * @param is
	 *            the input stream
	 * @param options
	 *            the options set for this module
	 * 
	 * @return the opened library
	 * @throws DesignFileException
	 *             If the file is not found, or the file contains fatal errors.
	 */
	public Library openLibrary( URL systemId, InputStream is,
			ModuleOption options ) throws DesignFileException
	{
		if ( is == null )
			throw new IllegalArgumentException( "The input stream must not be null" ); 
		initializeOptions( options );
		Library library = LibraryReader.getInstance( ).read( this,
				systemId,
				is,
				options );
		libraries.add( library );
		return library;
	}
	/**
	 * Creates a new design based on a file name.
	 *