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
* @param to
	 *            The new container.
	 * @param toSlotID
	 *            The slot within the new container.
	 * @throws ContentException
	 */
	public void move( DesignElement content, int fromSlotID, DesignElement to,
			int toSlotID ) throws ContentException
	{
		doMove( content, fromSlotID, to, toSlotID, -1 );
	}
	/**
	 * Moves an element from one position to another within the same slot.
	 * <p>
	 * For example, if a slot has A, B, C elements in order, when move A element
	 * to <code>newPosn</code> with the value 2, the sequence becomes B, A, C.
	 * 
	 * 
	 * @param content
	 *            The element to move.
	 * @param slotID
	 *            The slot that contains the element.
	 * @param newPosn
	 *            The new position within the slot. Note that the range of
	 *            <code>newPos</code> is from 0 to the number of element in
	 *            the slot with the ID <code>slotID</code>.
	 * @throws ContentException
	 *             if the content cannot be moved to new container.
	 */
	public void movePosition( DesignElement content, int slotID, int newPosn )