[bos #42217][EDF 28921] Horseshoe with bodyfitting.

Intermediate commit - parallel compute is disabled, some unrelated code commented out for debug!
Hexahedron::compute() was splitted to smaller methods.
Added debug output.
SMDS_MeshElement::Print() now is a virtual method, otherwise only parent method was called.

src/SMDS/SMDS_FaceOfNodes.hxx

@@ -32,7 +32,7 @@
 class SMDS_EXPORT SMDS_FaceOfNodes: public SMDS_CellOfNodes
 {
  public:
-  void Print(std::ostream & OS) const;
+  virtual void Print(std::ostream & OS) const override;
   SMDS_FaceOfNodes(const SMDS_MeshNode* node1,
                    const SMDS_MeshNode* node2,
                    const SMDS_MeshNode* node3);

src/SMDS/SMDS_MeshElement.hxx

@@ -142,7 +142,7 @@ public:
 
   SMDS_Mesh* GetMesh() const;
 
-  void Print(std::ostream & OS) const;
+  virtual void Print(std::ostream & OS) const;
 
   friend SMDS_EXPORT std::ostream & operator <<(std::ostream & OS, const SMDS_MeshElement *);
   friend class SMDS_ElementFactory;

src/SMDS/SMDS_MeshNode.hxx

@@ -65,7 +65,7 @@ class SMDS_EXPORT SMDS_MeshNode: public SMDS_MeshElement
   virtual bool IsMediumNode(const SMDS_MeshNode* /*node*/) const  { return false; }
   virtual int  NbCornerNodes() const { return 1; }
 
-  void Print(std::ostream & OS) const;
+  virtual void Print(std::ostream & OS) const override;
 
  private:
 

src/SMDS/SMDS_PolygonalFaceOfNodes.hxx

@@ -47,7 +47,7 @@ class SMDS_EXPORT SMDS_PolygonalFaceOfNodes : public SMDS_CellOfNodes
   virtual int NbEdges() const;
   virtual int NbFaces() const;
 
-  virtual void Print (std::ostream & OS) const;
+  virtual void Print (std::ostream & OS) const override;
 
   virtual const SMDS_MeshNode* GetNode(const int ind) const;
 

src/SMDS/SMDS_VolumeOfNodes.hxx

@@ -62,7 +62,7 @@ class SMDS_EXPORT SMDS_VolumeOfNodes: public SMDS_CellOfNodes
                    const int            nbNodes);
   ~SMDS_VolumeOfNodes();
 
-  void Print(std::ostream & OS) const;
+  virtual void Print(std::ostream & OS) const override;
   int NbFaces() const;
   int NbNodes() const;
   int NbEdges() const;