Apply the undo operation, in this implementation of the
RawStore, it can only call the undoMe method of undoOp
Parameters: xact - the Transaction that is doing the rollback Parameters: instant - the log instant of this compenstaion operation Parameters: in - optional data exception: IOException - Can be thrown by any of the methods of ObjectInput. exception: StandardException - Standard Cloudscape policy. See Also:ContainerOperation.generateUndo