message: Fix formatting, tweak logging.
  When the xthinblock is rejected for not extending the chain, request
  a full block rather than a thin block - our current mempool is unlikely
  to help the thinblock code much for an old block.
diff: @@ -275,8 +275,7 @@ bool CXThinBlock::HandleMessage(CDataStream &vRecv, CNode *pfrom, string strComm
  if (!IsThinBlockValid(pfrom, thinBlock.vMissingTx, thinBlock.header))
  {
  Misbehaving(pfrom->GetId(), 100);
  - LogPrintf("Received an invalid %s from peer %s (%d)\n",
  - strCommand, pfrom->addrName.c_str(), pfrom->id);
  + LogPrintf("Received an invalid %s from peer %s (%d)\n", strCommand, pfrom->addrName.c_str(), pfrom->id);
  return true;
  }
  @@ -289,8 +288,8 @@ bool CXThinBlock::HandleMessage(CDataStream &vRecv, CNode *pfrom, string strComm
  {
  if (nDoS > 0)
  Misbehaving(pfrom->GetId(), nDoS);
  - LogPrintf("Received an invalid %s header from peer %s (%d)\n",
  - strCommand, pfrom->addrName.c_str(), pfrom->id);
  + LogPrintf("Received an invalid %s header from peer %s (%d)\n", strCommand, pfrom->addrName.c_str(),
  + pfrom->id);
  }
  return true;
  @@ -312,21 +311,21 @@ bool CXThinBlock::HandleMessage(CDataStream &vRecv, CNode *pfrom, string strComm
  inv.hash = pIndex->GetBlockHash();
  - // Request thin block if it isn't extending the best chain
  + // Request full block if it isn't extending the best chain
  if (pIndex->nChainWork <= chainActive.Tip()->nChainWork)
  {
  vector<CInv> vGetData;
  - vGetData.push_back(CInv(MSG_THINBLOCK, inv.hash));
  -
  + vGetData.push_back(inv);
  pfrom->PushMessage(NetMsgType::GETDATA, vGetData);
  - LogPrintf("xthinblock does not extend longest chain; re-requesting as a thinblock\n");
  +
  + LogPrintf("%s %s from peer %s (%d) received but does not extend longest chain; requesting full block\n",
  + strCommand, inv.hash.ToString(), pfrom->addrName.c_str(), pfrom->id);
  return true;
  }
  if (nHops > 0)
  {
  - LogPrint("thin",
  - "Received new expedited thinblock %s from peer %s (%d) hop %d size %d bytes\n",
  + LogPrint("thin", "Received new expedited thinblock %s from peer %s (%d) hop %d size %d bytes\n",
  inv.hash.ToString(), pfrom->addrName.c_str(), pfrom->id, nHops, nSizeThinBlock);
  }
  else
  