Bug 5699 Add ResourceTransfer to packages view
The packages view should add the ResoruceTransfer as a drag source to its list of transfers
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/SelectionTransferDropAdapter.java
protected boolean isOkToProceed(ReorgRefactoring refactoring) throws JavaModelException{
			if (!super.isOkToProceed(refactoring))
				return false;
			return askIfUpdateReferences((MoveRefactoring)refactoring);
		}
		
		
		private boolean askIfUpdateReferences(MoveRefactoring ref) throws JavaModelException{
			if (! ref.canUpdateReferences()){
				setShowPreview(false);
				return true;
			}	
			switch (askIfUpdateReferences()){
				case IDialogConstants.CANCEL_ID:
				   setShowPreview(false);
					return false;
				case IDialogConstants.NO_ID:
					ref.setUpdateReferences(false);
					setShowPreview(false);
					return true;	
				case IDialogConstants.YES_ID:
					ref.setUpdateReferences(true);
					setShowPreview(false);
					return true;
				case PREVIEW_ID:		 
					ref.setUpdateReferences(true);
					setShowPreview(true);
					return true;
				default: