prepare for change in Qz resolution mechanism

Sim/Scan/QzScan.h

@@ -72,7 +72,8 @@ public:
 private:
     QzScan(IAxis* qs_nm);
     std::unique_ptr<IScanResolution> m_resolution;
-
+    std::vector<double> m_resol_width;
+    bool m_relative_resolution{false};
     double m_offset = 0.;
 #endif // SWIG
 };