Fix problem with THcHallCSpectrometer::CalculateTargetQuantities

Previous was trying to return the reconstructed target
quantities as values which was totaly wrong.

Changed so that the references are returned. Now get the
reconstructed target quantities properly.

src/THcHallCSpectrometer.cxx

@@ -358,7 +358,7 @@ Int_t THcHallCSpectrometer::FindVertices( TClonesArray& tracks )
     Double_t xptar=kBig,yptar=kBig,ytar=kBig,delta=kBig;
     Double_t xtar=0;
     CalculateTargetQuantities(track,xtar,xptar,ytar,yptar,delta); 
-    // Transfer results to track
+      // Transfer results to track
     // No beam raster yet
     //; In transport coordinates phi = hyptar = dy/dz and theta = hxptar = dx/dz
     //;    but for unknown reasons the yp offset is named  htheta_offset
@@ -369,7 +369,7 @@ Int_t THcHallCSpectrometer::FindVertices( TClonesArray& tracks )
     // There is an hpcentral_offset that needs to be applied somewhere.
     // (happly_offs)
     Double_t ptemp = fPcentral*(1+track->GetDp()/100.0);
-    track->SetMomentum(ptemp);
+      track->SetMomentum(ptemp);
     TVector3 pvect_temp;
     TransportToLab(track->GetP(),track->GetTTheta(),track->GetTPhi(),pvect_temp);
     track->SetPvect(pvect_temp);
@@ -387,7 +387,7 @@ Int_t THcHallCSpectrometer::FindVertices( TClonesArray& tracks )
   return 0;
 }
 //
-void THcHallCSpectrometer::CalculateTargetQuantities(THaTrack* track,Double_t gbeam_y,Double_t  xptar,Double_t ytar,Double_t yptar,Double_t delta) 
+void THcHallCSpectrometer::CalculateTargetQuantities(THaTrack* track,Double_t& gbeam_y,Double_t&  xptar,Double_t& ytar,Double_t& yptar,Double_t& delta) 
 {
     Double_t hut[5];
     Double_t hut_rot[5];

src/THcHallCSpectrometer.h

@@ -41,7 +41,7 @@ public:
 
   virtual Int_t   ReadDatabase( const TDatime& date );
   virtual void    EnforcePruneLimits();
-  virtual void    CalculateTargetQuantities(THaTrack* track,Double_t gbeam_y,Double_t  xptar,Double_t ytar,Double_t yptar,Double_t delta);
+  virtual void    CalculateTargetQuantities(THaTrack* track,Double_t& gbeam_y,Double_t&  xptar,Double_t& ytar,Double_t& yptar,Double_t& delta);
   virtual Int_t   FindVertices( TClonesArray& tracks );
   virtual Int_t   TrackCalc();
   virtual Int_t   BestTrackSimple();