Revert changes

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GCS/Geo.h

@@ -174,10 +174,6 @@ public:
 class Curve
 {
 public:
-    // start in Arc
-    Point* start_ref;
-    // end in Arc
-    Point* end_ref;
     virtual ~Curve()
     {}
     // returns normal vector. The vector should point to the left when one
@@ -233,6 +229,8 @@ public:
     Point p1;
     Point p2;
 
+    Point* start_ref;
+    Point* end_ref;
     DeriVector2 CalculateNormal(const Point& p, const double* derivparam = nullptr) const override;
     DeriVector2 Value(double u, double du, const double* derivparam = nullptr) const override;
     int PushOwnParams(VEC_pD& pvec) override;