net: define NodeId as an int64_t

This should make occurances of NodeId wrapping essentially impossible for
real-world usage.

src/net.h

@@ -92,7 +92,7 @@ static const ServiceFlags REQUIRED_SERVICES = NODE_NETWORK;
 // NOTE: When adjusting this, update rpcnet:setban's help ("24h")
 static const unsigned int DEFAULT_MISBEHAVING_BANTIME = 60 * 60 * 24;  // Default 24-hour ban
 
-typedef int NodeId;
+typedef int64_t NodeId;
 
 struct AddedNodeInfo
 {

src/qt/peertablemodel.cpp

@@ -166,7 +166,7 @@ QVariant PeerTableModel::data(const QModelIndex &index, int role) const
         switch(index.column())
         {
         case NetNodeId:
-            return rec->nodeStats.nodeid;
+            return (qint64)rec->nodeStats.nodeid;
         case Address:
             return QString::fromStdString(rec->nodeStats.addrName);
         case Subversion:

src/qt/rpcconsole.cpp

@@ -1118,7 +1118,7 @@ void RPCConsole::disconnectSelectedNode()
     for(int i = 0; i < nodes.count(); i++)
     {
         // Get currently selected peer address
-        NodeId id = nodes.at(i).data().toInt();
+        NodeId id = nodes.at(i).data().toLongLong();
         // Find the node, disconnect it and clear the selected node
         if(g_connman->DisconnectNode(id))
             clearSelectedNode();
@@ -1135,7 +1135,7 @@ void RPCConsole::banSelectedNode(int bantime)
     for(int i = 0; i < nodes.count(); i++)
     {
         // Get currently selected peer address
-        NodeId id = nodes.at(i).data().toInt();
+        NodeId id = nodes.at(i).data().toLongLong();
 
 	// Get currently selected peer address
 	int detailNodeRow = clientModel->getPeerTableModel()->getRowByNodeId(id);