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
*            status whether to un-resolve the references
	 * @throws SemanticException
	 *             if this content cannot be removed from container.
	 */
	public void remove( DesignElement content, int slotID,
			boolean unresolveReference ) throws SemanticException
	{
		doRemove( content, slotID, unresolveReference, false );
	}
	/**
	 * Removes an item from its container. This is equivalent to deleting the
	 * element from the design. Because the element is being deleted, we must
	 * clean up all references to or from the element. References include:
	 * <p>
	 * <ul>
	 * <li>The elements that this content extends.
	 * <li>The elements that extend this content.
	 * <li>The style that this content uses.
	 * <li>The elements that use this style.
	 * <li>The elements that this content contains.
	 * <li>The name space that contains this content.
	 * </ul>
	 * 
	 * @param content
	 *            the element to remove
	 * @param slotID
	 *            the slot from which to remove the content
	 * @param unresolveReference
	 *            status whether to un-resolve the references
	 * @param flag