Bug 136279 Structure and table datatypes should be hidden.
Description: Structure and table datatype should be hidden. Steps to reproduce: In table data binding, I saw structure and table two datatypes. They are not supported now, so they should be removed.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ModuleHandle.java
* @param namespace
	 *            library namespace
	 * @throws DesignFileException
	 *             if the library file is not found, or has fatal error.
	 * @throws SemanticException
	 *             if error is encountered when handling
	 *             <code>IncludeLibrary</code> structure list.
	 */
	public void includeLibrary( String libraryFileName, String namespace )
			throws DesignFileException, SemanticException
	{
		LibraryCommand command = new LibraryCommand( module );
		command.addLibrary( libraryFileName, namespace );
	}
	/**
	 * Drops the given library from the included libraries of this design file.
	 * 
	 * @param library
	 *            the library to drop
	 * @throws SemanticException
	 *             if error is encountered when handling
	 *             <code>IncludeLibrary</code> structure list. Or it maybe
	 *             because that the given library is not found in the design. Or
	 *             that the library has descedents in the current module
	 */
	public void dropLibrary( LibraryHandle library ) throws SemanticException
	{
		if ( library == null )
			return;
		LibraryCommand command = new LibraryCommand( module );