Ref T372, Ref T370 testing with emulated driver fixes

* added ground speed
* changed altitude parsing to CPqString::SeparatorsBestGuess
* signal when parts form is set

src/blackgui/editors/situationform.h

@@ -77,6 +77,9 @@ namespace BlackGui
             //! Get barometric pressure at MSL (mean sea level)
             BlackMisc::PhysicalQuantities::CPressure getBarometricPressureMsl() const;
 
+            //! Get ground speed
+            BlackMisc::PhysicalQuantities::CSpeed getGroundSpeed() const;
+
             //! Get pressure at mean sea level
             double getBarometricPressureMslMillibar() const;