Bug 153040 Template definition should be removed after the report item is deleted
Steps to reproduce: 1.New a report, extends lib.label 2.Convert the label to template report item, and revert it back to the report item 3.Delete the label 4.Remove the included library Expected result: Library can be removed Actual result: A BIRT exception occurred. Plug-in Provider:Eclipse.org Plug-in Name:BIRT Model Plug-in ID:org.eclipse.birt.report.model Version:2.1.0.v20060808-0630 Error Code:Error.LibraryException.LIBRARY_HAS_DESCENDENTS Error Message:The library "Lib" can no be dropped because it has descendents "NewLabel" in the current module.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/metadata/MetaDataDictionary.java
* @return True if new elements should use element IDs.
	 */
	public boolean useID( )
	{
		return useElementID;
	}
	/**
	 * Adds a predefined style to the dictionary.
	 * 
	 * @param style
	 *            the predefined style
	 * @throws MetaDataException
	 *             if exception occur when adding the style, it may be because
	 *             the style missing its name or an style with the same name
	 *             already exists.
	 */
	void addPredefinedStyle( PredefinedStyle style ) throws MetaDataException
	{
		String name = style.getName( );
		if ( StringUtil.isBlank( name ) )
			throw new MetaDataException(
					MetaDataException.DESIGN_EXCEPTION_MISSING_STYLE_NAME );
		if ( predefinedStyles.get( name ) != null )
			throw new MetaDataException( new String[]{name},
					MetaDataException.DESIGN_EXCEPTION_DUPLICATE_STYLE_NAME );
		predefinedStyles.put( name, style );
	}
	/**
	 * Finds a predefined style definition.
	 *