Replace default implementation in epaxos.pb.go to get printing pete expects and shows in movies.

func (i *Instance) String() string {
	return fmt.Sprintf("rep %d/sl %d/se %d/st %d %q deps %v, op %v",
		i.Rep, i.Slot, i.Seq, i.State, i.Ops[0].Key, i.Deps, i.Ops[0].Type)
}
