0029792: Add ::IsParallel method to GeomAPI_Extrema* classes

Add IsParallel() methods for classes:
- GeomAPI_ExtremaCurveCurve
- GeomAPI_ExtremaCurveSurface
- GeomAPI_ExtremaSurfaceSurface

src/Extrema/Extrema_ExtSS.hxx

@@ -63,7 +63,7 @@ public:
   //! Returns True if the distances are found.
   Standard_EXPORT Standard_Boolean IsDone() const;
   
-  //! Returns True if the curve is on a parallel surface.
+  //! Returns True if the surfaces are parallel
   Standard_EXPORT Standard_Boolean IsParallel() const;
   
   //! Returns the number of extremum distances.

src/GeomAPI/GeomAPI_ExtremaCurveCurve.hxx

@@ -125,6 +125,12 @@ Standard_EXPORT operator Standard_Integer() const;
   //! 1,NbExtrema ], where NbExtrema is the
   //! number of extrema computed by this algorithm.
   Standard_EXPORT Standard_Real Distance (const Standard_Integer Index) const;
+
+  //! Returns True if the two curves are parallel.
+  Standard_Boolean IsParallel() const
+  {
+    return myExtCC.IsParallel();
+  }
   
   //! Returns the points P1 on the first curve and P2 on
   //! the second curve, which are the ends of the shortest

src/GeomAPI/GeomAPI_ExtremaCurveSurface.hxx

@@ -127,6 +127,12 @@ Standard_EXPORT operator Standard_Integer() const;
   //! 1,NbExtrema ], where NbExtrema is the
   //! number of extrema computed by this algorithm.
   Standard_EXPORT Standard_Real Distance (const Standard_Integer Index) const;
+
+  //! Returns True if the curve is on a parallel surface.
+  Standard_Boolean IsParallel() const
+  {
+    return myExtCS.IsParallel();
+  }
   
   //! Returns the points PC on the curve and PS on the
   //! surface, which are the ends of the shortest extremum computed by this algorithm.

src/GeomAPI/GeomAPI_ExtremaSurfaceSurface.hxx

@@ -128,6 +128,12 @@ Standard_EXPORT operator Standard_Integer() const;
   //! 1,NbExtrema ], where NbExtrema is the
   //! number of extrema computed by this algorithm.
   Standard_EXPORT Standard_Real Distance (const Standard_Integer Index) const;
+
+  //! Returns True if the surfaces are parallel
+  Standard_Boolean IsParallel() const
+  {
+    return myExtSS.IsParallel();
+  }
   
   //! Returns the points P1 on the first surface and P2 on
   //! the second surface, which are the ends of the