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/command/ContentCommand.java
* are identified by a container ID.
	 * 
	 * @param from
	 *            the old element to replace
	 * @param to
	 *            the new element to replace
	 * @param slotID
	 *            the slot from which to replace the old element
	 * @param unresolveReference
	 *            status whether to un-resolve the references or set the
	 *            reference to null
	 * @throws SemanticException
	 *             if the old element cannot be replaced by the new element into
	 *             this container.
	 */
	public void transformTemplate( DesignElement from, DesignElement to,
			int slotID, boolean unresolveReference ) throws SemanticException
	{
		doReplace( from, to, slotID, unresolveReference );
	}
	/**
	 * @see #transformTemplate(DesignElement, DesignElement, int, boolean)
	 * 
	 * @param oldElement
	 *            the old element to replace
	 * @param newElement
	 *            the new element to replace
	 * @param slotID
	 *            the slot from which to replace the old element
	 * @param unresolveReference