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/XSControl/XSControl_Functions.cxx

@@ -140,7 +140,6 @@ static IFSelect_ReturnStatus XSControl_xnorm(const Handle(IFSelect_SessionPilot)
     IFSelect_Activator::SetCurrentAlias (WS->SelectedNorm(Standard_True));
     return IFSelect_RetDone;
   }
-  return IFSelect_RetVoid;
 }