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
* <p>
	 * The order and number of items in this list must match the corresponding
	 * constants in the MetaDataConstants class.
	 */
	private PropertyType[] propertyTypes = new PropertyType[PropertyType.TYPE_COUNT];
	/**
	 * Map of choice types. A choice type is a named set of property choices. It
	 * provides additional information for properties of the type choice.
	 */
	private HashMap choiceSets = new HashMap( );
	/**
	 * Map of structures. A structure represents an object in Java. It describes
	 * the members of the object that are to be visible to the UI. Such objects
	 * are generally kept property defined as a structure list.
	 */
	private HashMap structures = new HashMap( );
	/**
	 * Map of classes. A class represents an Object in Script. It describes the
	 * constructors, members and methods.
	 */
	private Map classes = new LinkedHashMap( );
	/**
	 * Whether to apply element ids to newly created elements. This feature is
	 * used for the web environment, but not for the Eclipse environment.
	 */
	private boolean useElementID = false;
	/**
	 * The list of predefined styles. This list only identifies the styles
	 * themselves, but not give their properties.
	 * <p>