0024023: Revamp the OCCT Handle - gcc and clang

Adaptations for compiling with GCC 4.7 and 4.8:
- Construction semantics is used for Handle objects being initialized by const Handle objects of derived type, to avoid overload resolution error in GCC 4.7.
- Missing includes added.
- Fixed bugs related to misuse of direct casts of handle.
- Eliminate CLang warnings on uninitialized and unused variables, functions, and expressions

src/IntTools/IntTools_FaceFace.cxx

@@ -821,8 +821,8 @@ Standard_Real IntTools_FaceFace::ComputeTolerance()
           }
         }
       }
+      }
     }
-  }
   //
   return aDMax;
 }
@@ -2178,30 +2178,6 @@ Standard_Real IntTools_FaceFace::ComputeTolerance()
     
   case IntPatch_Restriction: 
     {
-      GeomAbs_SurfaceType typS1 = myHS1->Surface().GetType();
-      GeomAbs_SurfaceType typS2 = myHS2->Surface().GetType();
-      Standard_Boolean isAnalS1 = Standard_False;
-      switch (typS1)
-      {
-      case GeomAbs_Plane:
-      case GeomAbs_Cylinder:
-      case GeomAbs_Sphere:
-      case GeomAbs_Cone: 
-      case GeomAbs_Torus: isAnalS1 = Standard_True; break;
-      default: break;
-      }
-
-      Standard_Integer isAnalS2 = Standard_False;
-      switch (typS2)
-      {
-      case GeomAbs_Plane:
-      case GeomAbs_Cylinder:
-      case GeomAbs_Sphere:
-      case GeomAbs_Cone: 
-      case GeomAbs_Torus: isAnalS2 = Standard_True; break;
-      default: break;
-      }
-
       Handle(IntPatch_RLine) RL = 
         Handle(IntPatch_RLine)::DownCast(L);
       Handle(Geom_Curve) aC3d;