[Qt] tweak new peers tab in console window

- remove starting height as table header and replace with ping time
- remove columnResizingFixer
- add local address (if available) in detailed node view (on top of the
  right view below the remote address)
- remove some .c_str() by using QString::fromStdString()
- rename Address to Address/Hostname
- rename secs to just s for ping time
- use MODEL_UPDATE_DELAY from guiconstants.h for the peer refresh time
- make PeerTableModel::columnCount() return no hard-coded value
- remove and cleanup dup private: section in RPCConsole header
- add new defaults for column sizes
- remove behaviour which keeps disconnected peers selected and also remove
  code which keeps track of last selected peer stats
- add sync height to detail view
- add some additional NULL pointer checks for clientModel in
  rpcconsole.cpp

src/qt/peertablemodel.h

@@ -19,8 +19,9 @@ class QTimer;
 QT_END_NAMESPACE
 
 struct CNodeCombinedStats {
-    CNodeStats nodestats;
-    CNodeStateStats statestats;
+    CNodeStats nodeStats;
+    CNodeStateStats nodeStateStats;
+    bool fNodeStateStatsAvailable;
 };
 
 class NodeLessThan
@@ -47,13 +48,13 @@ public:
     explicit PeerTableModel(ClientModel *parent = 0);
     const CNodeCombinedStats *getNodeStats(int idx);
     int getRowByNodeId(NodeId nodeid);
-    void startAutoRefresh(int msecs);
+    void startAutoRefresh();
     void stopAutoRefresh();
 
     enum ColumnIndex {
         Address = 0,
         Subversion = 1,
-        Height = 2
+        Ping = 2
     };
 
     /** @name Methods overridden from QAbstractTableModel