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
* <ul>
	 * <li>If the element name is required and duplicate name is found in name
	 * space, rename the element with a new unique name.
	 * <li>If the element name is not required, clear the name.
	 * </ul>
	 * 
	 * @param elementHandle
	 *            the element handle whose name is need to check.
	 */
	public void rename( DesignElementHandle elementHandle )
	{
		if ( elementHandle == null )
			return;
		IElementDefn defn = elementHandle.getElement( ).getDefn( );
		if ( defn.getNameOption( ) == MetaDataConstants.REQUIRED_NAME
				|| elementHandle.getModuleHandle( ) instanceof LibraryHandle
				|| elementHandle.getName( ) != null )
			module.makeUniqueName( elementHandle.getElement( ) );
		for ( int i = 0; i < defn.getSlotCount( ); i++ )
		{
			ContainerSlot slot = elementHandle.getElement( ).getSlot( i );
			if ( slot != null )
			{
				for ( int pos = 0; pos < slot.getCount( ); pos++ )
				{
					DesignElement innerElement = slot.getContent( pos );
					rename( innerElement.getHandle( module ) );
				}
			}
		}