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/ReportDesignHandle.java
* @param displayName
	 *            the display name
	 * @throws SemanticException
	 *             if the display name property is locked or not defined on this
	 *             design.
	 */
	public void setDisplayName( String displayName ) throws SemanticException
	{
		setStringProperty( DesignElement.DISPLAY_NAME_PROP, displayName );
	}
	/**
	 * Gets the display name.
	 * 
	 * @return the display name
	 */
	public String getDisplayName( )
	{
		return getStringProperty( DesignElement.DISPLAY_NAME_PROP );
	}
	/**
	 * Sets the design icon/thumbnail file path.
	 * 
	 * @param iconFile
	 *            the design icon/thumbnail file path to set
	 * @throws SemanticException
	 *             if the property is locked or not defined on this design.
	 */
	public void setIconFile( String iconFile ) throws SemanticException
	{
		setStringProperty( ReportDesign.ICON_FILE_PROP, iconFile );