use correct method for getting row count from the DB; use signals/slots to inform the CabrilloLogWindow the qso_count has changed

widgets/CabrilloLogWindow.cpp

@@ -72,6 +72,7 @@ CabrilloLogWindow::CabrilloLogWindow (QSettings * settings, Configuration const
   auto h_header = m_->ui_.log_table_view->horizontalHeader ();
   m_->ui_.log_table_view->verticalHeader()->setVisible(false); // turn off line numbers for the table view
   h_header->moveSection (7, 1); // band to first column
+
 }
 
 CabrilloLogWindow::~CabrilloLogWindow ()
@@ -88,7 +89,6 @@ void CabrilloLogWindow::log_model_changed (int row)
     {
       m_->log_model_->select ();
     }
-  this->set_nQSO(m_->log_model_->rowCount());
 }
 
 void CabrilloLogWindow::set_nQSO(int n)