Added RTPlan reader & visualisationof CrossHair at isocenter. This is currently working in DICOM coordinates (in other words if DRTs are not regenerated according to Iso and Table position).

YET TO DO:
- disable visualisation of crossHair
- widget with Emit for full screen visualisation
- bug on wipe visulisation of contours + opacity
- clean data when unloading

reg23Topograms/itkDTRrecon/vtkContourTopogramProjectionFilter.cxx

@@ -148,6 +148,8 @@ int vtkContourTopogramProjectionFilter::RequestData(
         pp2[1] -= dProjectionLPSOffset [1];
         pp2[2] -= dProjectionLPSOffset [2];
 
+//        std::cout << ii << " " << pp2[0] << " " << pp2[1] << " " << pp2[2] << std::endl;
+
         PrjPoints->InsertPoint(ii,pp2);
      }