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
* </tr>
 * 
 * <tr>
 * <td>Data Sources</td>
 * <td>The connections used by the report.</td>
 * </tr>
 * 
 * <tr>
 * <td>Data Sets</td>
 * <td>Data sets defined in the design.</td>
 * </tr>
 * 
 * <tr>
 * <td>Color Palette</td>
 * <td>A set of custom color names as part of the design.</td>
 * </tr>
 * 
 * <tr>
 * <td>Styles</td>
 * <td>User-defined styles used to format elements in the report. Each style
 * must have a unique name within the set of styles for this report.</td>
 * </tr>
 * 
 * <tr>
 * <td>Page Setup</td>
 * <td>The layout of the master pages within the report.</td>
 * </tr>
 * 
 * <tr>
 * <td>Components</td>