Improve well path modeling

* Improve handling of MD at first target
* When sea level well target is disabled, update MD of first target
* Show well target spheres by default, allow toggling of spheres
* Activate well target modifiers when clicking on well targets
* Remove selection update causing an unstable 3D view
* Improve display and handling of multiple locations
* Add special 3D target for tie in well target
* Add slider to tie in MD input field
* Show MD in well path target table
* Delete all well path laterals when deleting a well path

* Python : Add lateral to parent well
* Python : Add perforation interval

ApplicationLibCode/ModelVisualization/RivDrawableSpheres.h

@@ -0,0 +1,39 @@
+/////////////////////////////////////////////////////////////////////////////////
+//
+//  Copyright (C) 2021 -     Equinor ASA
+//
+//  ResInsight is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  ResInsight is distributed in the hope that it will be useful, but WITHOUT ANY
+//  WARRANTY; without even the implied warranty of MERCHANTABILITY or
+//  FITNESS FOR A PARTICULAR PURPOSE.
+//
+//  See the GNU General Public License at <http://www.gnu.org/licenses/gpl.html>
+//  for more details.
+//
+/////////////////////////////////////////////////////////////////////////////////
+
+#pragma once
+
+#include "cvfDrawableVectors.h"
+
+class RivDrawableSpheres : public cvf::DrawableVectors
+{
+public:
+    RivDrawableSpheres();
+    RivDrawableSpheres( cvf::String vectorMatrixUniformName, cvf::String colorUniformName );
+
+    bool rayIntersectCreateDetail( const cvf::Ray&           ray,
+                                   cvf::Vec3d*               intersectionPoint,
+                                   cvf::ref<cvf::HitDetail>* hitDetail ) const override;
+
+    void setRadius( float radius );
+    void setCenterCoords( cvf::Vec3fArray* vertexArray );
+
+private:
+    cvf::ref<cvf::Vec3fArray> m_centerCoordArray; // Coordinates for sphere center
+    float                     m_radius; // Sphere radius
+};