Display calls in ActiveStations only when they are "ready to call". Erase on band change.

widgets/activeStations.cpp

@@ -83,3 +83,8 @@ void ActiveStations::setClickOK(bool b)
 {
   m_clickOK=b;
 }
+
+void ActiveStations::erase()
+{
+  ui->RecentStationsPlainTextEdit->clear();
+}