fixed Helix

Documentation/Examples/helix_example.cc

 #include <Units/PhysicalUnits.h>
 #include <Geometry/Vector.h>
 #include <Geometry/CoordinateSystem.h>
-#include <Geometry/Helix.h>
 #include <Geometry/Point.h>
+#include <Geometry/Helix.h>
 #include <cstdlib>
 #include <iostream>
 #include <array>

Framework/Geometry/Helix.h

@@ -9,7 +9,7 @@
 
 class Helix // TODO: inherit from to-be-implemented "Trajectory"
 {
-    using SpeedVec = Vector<Speed>;
+    using SpeedVec = Vector<Speed::dimension_type>;
     
     Point const r0;
     Frequency const omegaC;
@@ -21,7 +21,7 @@ class Helix // TODO: inherit from to-be-implemented "Trajectory"
 public:
     Helix(Point const pR0, phys::units::quantity<phys::units::frequency_d> pOmegaC,
         SpeedVec const pvPar, SpeedVec const pvPerp) :
-        r0(pR0), omegaC(pOmegaC), vPar(pvPar), vPerp(pvPerp), uPerp(vPerp.cross(vPar.normalized()),
+        r0(pR0), omegaC(pOmegaC), vPar(pvPar), vPerp(pvPerp), uPerp(vPerp.cross(vPar.normalized())),
         radius(pvPar.norm() / abs(pOmegaC))
     {