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/api/core/UserPropertyDefn.java
}
	/**
	 * Gets the property type.
	 * 
	 * @return integer represented user property type.
	 * 
	 */
	public int getValueType( )
	{
		return USER_PROPERTY;
	}
	/**
	 * Makes a copy of this user property definition.
	 * 
	 * @return IStructure of this property definition, or null if this property
	 *         definition can not be cloned.
	 */
	public IStructure copy( )
	{
		try
		{
			UserPropertyDefn uDefn = (UserPropertyDefn) clone( );
			if ( details instanceof ChoiceSet )
			{
				uDefn.details = ( (ChoiceSet) details ).clone( );
			}
			return uDefn;
		}
		catch ( CloneNotSupportedException e )
		{