message: athena.paxos.Client: Warn if elle's version does not support versionned quorum errors.
diff: @@ -302,8 +302,12 @@ namespace elle
  catch (typename Server::WrongQuorum const& e)
  {
  if (!e.proposal())
  + {
  // Not handled pre 0.4.0.
  + ELLE_WARN("throwing wrong quorum error unconditionally "
  + "because elle version is < 0.4.");
  throw;
  + }
  if (!wrong_quorum || *wrong_quorum->proposal() < *e.proposal())
  {
  ELLE_DEBUG("accept wrong quorum %f", *e.proposal());
  