0023824: Bad results of sweep operation when a path curve has unpredictable torsion along its way.

Adding test cases for this fix

src/BRepOffsetAPI/BRepOffsetAPI.cdl

@@ -28,7 +28,8 @@ uses
     StdFail,
     gp, 
     GeomAbs,
-    Geom, 
+    Geom,
+    GeomFill,
     Approx,
     TopoDS,
     TopTools, 

src/BRepOffsetAPI/BRepOffsetAPI_MakePipe.cdl

@@ -35,6 +35,7 @@ class MakePipe from BRepOffsetAPI inherits MakeSweep from BRepPrimAPI
     	-- with G1 continuous spines only.
 uses
     Pipe        from BRepFill,
+    Trihedron   from GeomFill,
     Wire        from TopoDS,
     Shape       from TopoDS,
     Edge        from TopoDS,
@@ -58,6 +59,21 @@ is
     	-- composite solid.
     returns MakePipe from BRepOffsetAPI;
     
+    SetMode(me : in out;
+    	    aMode : Trihedron from GeomFill);
+    	---Purpose: Set the mode of sweeping
+    	--          It can be:
+    	--          - Frenet
+    	--          - Corrected Frenet
+    	--          - Discrete Trihedron
+    	--          By default the mode is Corrected Frenet
+    
+    SetForceApproxC1(me : in out;
+    	    	     ForceApproxC1 : Boolean from Standard);
+	---Purpose: Set the flag that indicates attempt to approximate
+	--          a C1-continuous surface if a swept surface proved
+	--          to be C0.
+
 
     Pipe(me) returns Pipe from BRepFill
 	---C++: return const &

src/BRepOffsetAPI/BRepOffsetAPI_MakePipe.cxx

@@ -40,6 +40,32 @@ BRepOffsetAPI_MakePipe::BRepOffsetAPI_MakePipe(const TopoDS_Wire&  Spine ,
   Build();
 }
 
+//=======================================================================
+//function : SetMode
+//purpose  : Set the mode of sweeping
+//           It can be:
+//           - Frenet
+//           - Corrected Frenet
+//           - Discrete Trihedron
+//=======================================================================
+
+void BRepOffsetAPI_MakePipe::SetMode(const GeomFill_Trihedron aMode)
+{
+  myPipe.SetMode(aMode);
+}
+
+//=======================================================================
+//function : SetForceApproxC1
+//purpose  : Set the flag that indicates attempt to approximate
+//           a C1-continuous surface if a swept surface proved
+//           to be C0.
+//=======================================================================
+
+void BRepOffsetAPI_MakePipe::SetForceApproxC1(const Standard_Boolean ForceApproxC1)
+{
+  myPipe.SetForceApproxC1(ForceApproxC1);
+}
+
 //=======================================================================
 //function : Pipe
 //purpose  : 

src/BRepOffsetAPI/BRepOffsetAPI_MakePipeShell.cdl

@@ -73,6 +73,10 @@ is
         --          to  perform  the  sweeping 
     	--	 If IsFrenet is false, a corrected Frenet trihedron is used.
     
+    SetDiscreteMode(me  :  in  out);
+    	---Purpose: Sets a Discrete trihedron  
+        --          to  perform  the  sweeping 
+    
     SetMode(me  :  in  out;  Axe  :  Ax2  from  gp); 
     	---Purpose: Sets  a  fixed  trihedron  to  perform  the  sweeping 
         --         all sections will be parallel.
@@ -110,6 +114,7 @@ is
 
         ---Level: Public
 
+
 -- =================================
 --  Methodes to define section(s)
 -- ================================= 
@@ -212,6 +217,12 @@ is
     	-- - boundary tolerance BoundTol
     	-- - angular tolerance TolAngular.
         
+    SetForceApproxC1(me  :  in  out;
+    	    	     ForceApproxC1 : Boolean from Standard);
+	---Purpose: Set the flag that indicates attempt to approximate
+	--          a C1-continuous surface if a swept surface proved
+	--          to be C0.
+
     SetTransitionMode(me  :  in  out;  
     	              Mode  :TransitionMode  from  BRepBuilderAPI  =  BRepBuilderAPI_Transformed)  
 	---Purpose: Sets the transition mode to manage discontinuities on

src/BRepOffsetAPI/BRepOffsetAPI_MakePipeShell.cxx

@@ -49,6 +49,15 @@ BRepOffsetAPI_MakePipeShell::BRepOffsetAPI_MakePipeShell(const TopoDS_Wire& Spin
   myPipe->Set(IsFrenet);
 }
 
+//=======================================================================
+//function : SetDiscreteMode
+//purpose  : 
+//=======================================================================
+ void BRepOffsetAPI_MakePipeShell::SetDiscreteMode() 
+{
+  myPipe->SetDiscrete();
+}
+
 //=======================================================================
 //function : SetMode
 //purpose  : 
@@ -185,8 +194,9 @@ void BRepOffsetAPI_MakePipeShell::Delete( const TopoDS_Shape& Profile)
   }
   return Status;
 }
+
 //=======================================================================
-//function : SetTransitionMode
+//function : SetTolerance
 //purpose  : 
 //=======================================================================
  void BRepOffsetAPI_MakePipeShell::SetTolerance(const Standard_Real Tol3d,
@@ -196,6 +206,17 @@ void BRepOffsetAPI_MakePipeShell::Delete( const TopoDS_Shape& Profile)
  myPipe->SetTolerance(Tol3d, BoundTol, TolAngular);
 }
 
+//=======================================================================
+//function : SetForceApproxC1
+//purpose  : Set the flag that indicates attempt to approximate
+//           a C1-continuous surface if a swept surface proved
+//           to be C0.
+//=======================================================================
+ void BRepOffsetAPI_MakePipeShell::SetForceApproxC1(const Standard_Boolean ForceApproxC1)
+{
+  myPipe->SetForceApproxC1(ForceApproxC1);
+}
+
 //=======================================================================
 //function : SetTransitionMode
 //purpose  :