Ref T241, further improved interpolation logging

* all interpolation positions can  be logged (3 for spline, 2 for linear)
* interpolated (log) time, setting to real time (i.e. unadjusted time)
* only set logger values with logger attached

src/blackmisc/simulation/interpolatorspline.h

@@ -95,6 +95,7 @@ namespace BlackMisc
         private:
             qint64 m_prevSampleTime = 0;
             qint64 m_nextSampleTime = 0;
+            std::array<Aviation::CAircraftSituation, 3> m_s;
             Interpolant m_interpolant;
         };
     } // ns