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/Draw/Draw_BasicCommands.cxx

@@ -416,10 +416,9 @@ static unsigned int __stdcall CpuFunc (void * param)
     {
       cout << "Process killed by CPU limit (" << CPU_LIMIT << " sec)" << endl;
       ExitProcess (2);
-      return 0;
+//      return 0;
     }
   }
-  return 0;
 }
 #else
 static void CpuFunc (int)

src/Draw/Draw_Window.cxx

@@ -1405,7 +1405,6 @@ LRESULT APIENTRY DrawWindow::DrawProc(HWND hWnd, UINT wMsg, WPARAM wParam, LPARA
     else
       return(DefMDIChildProc(hWnd, wMsg, wParam, lParam));
   }
-  return (0l);
 }