0024058: Eliminate compiler warning C4702 in MSVC++ with warning level 4

Got rid of most of warnings of C4702 type: unreachable code.
Returned some #ifdef DEB
Fixed tabs formatting
Fixed some mistakes in code

src/MAT2d/MAT2d_Circuit.cxx

@@ -828,7 +828,6 @@ static Standard_Boolean IsSharpCorner (const Handle(Geom2d_Geometry)& Geom1,
   else {
     return Standard_True;
   }
-  return Standard_False;
 }