Bug 176436 Charts Imported from Libraries do not update when libraries change
During a live presentation of BIRT at EclipseCon, we came across a rather embarassing issue. When charts are included in a library, and imported into a report design from a library, any changes to the library instance of the chart do not reflect in the report itself.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/command/LibraryCommand.java
* relationships. All child element will be localized in the module.
	 * 
	 * @param library
	 *            a given library to be dropped.
	 * @throws SemanticException
	 * 
	 */
	public void dropLibraryAndBreakExtends( Library library )
			throws SemanticException
	{
		
		if ( !module.getLibraries( ).contains( library ) )
		{
			throw new LibraryException( library, new String[]{library
					.getNamespace( )},
					LibraryException.DESIGN_EXCEPTION_LIBRARY_NOT_FOUND );
		}
		ActivityStack stack = getActivityStack( );
		stack.startTrans( );
		try
		{
			for ( int slotID = 0; slotID < library.getDefn( ).getSlotCount( ); slotID++ )
			{
				if ( slotID == ILibraryModel.THEMES_SLOT )
					continue;
				for ( Iterator iter = library.getSlot( slotID ).iterator( ); iter
						.hasNext( ); )
				{
					DesignElement element = (DesignElement) iter.next( );
					List derived = element.getDerived( );