Bitcoin-Qt: never display own block count > estimated block count

- some users reported it as weird, that the estimated block count could be
  lower than our own nodes block number (which is indeed true and not good)
- this pull adds a new default behaviour, which displays our own block
  number as estimated block number, if own >= est. block count
- the pull raises space for nodes block counts in cPeerBlockCounts to 8 to
  be more accurate
- also removes a reduntant setNumBlocks() call in RPCConsole and moves
  initialisation of numBlocksAtStartup in ClientModel, where it belongs

src/qt/rpcconsole.cpp

@@ -269,8 +269,6 @@ void RPCConsole::setClientModel(ClientModel *model)
 
         setNumConnections(model->getNumConnections());
         ui->isTestNet->setChecked(model->isTestNet());
-
-        setNumBlocks(model->getNumBlocks(), model->getNumBlocksOfPeers());
     }
 }
 
@@ -342,13 +340,10 @@ void RPCConsole::setNumConnections(int count)
 void RPCConsole::setNumBlocks(int count, int countOfPeers)
 {
     ui->numberOfBlocks->setText(QString::number(count));
-    ui->totalBlocks->setText(QString::number(countOfPeers));
+    // If there is no current countOfPeers available display N/A instead of 0, which can't ever be true
+    ui->totalBlocks->setText(countOfPeers == 0 ? tr("N/A") : QString::number(countOfPeers));
     if(clientModel)
-    {
-        // If there is no current number available display N/A instead of 0, which can't ever be true
-        ui->totalBlocks->setText(clientModel->getNumBlocksOfPeers() == 0 ? tr("N/A") : QString::number(clientModel->getNumBlocksOfPeers()));
         ui->lastBlockTime->setText(clientModel->getLastBlockDate().toString());
-    }
 }
 
 void RPCConsole::on_lineEdit_returnPressed()