0023934: Compiler warnings in MS VC++ 10

Elimination of compiler warnings
- ExprIntrp: generated file ExprIntrp.tab.c and related WOK scripts removed from the sources
- ExprIntrp, StepFile: added missing declarations and casts; warnings caused by Flex and Bison code suppressed for MSVC compuler by #pragma
- OSD: dummy #includes added to files containing no code for Windows, to avoid warning on empty file
- PLib: piece of code contained in PLib_ChangeDim.gxx included explicitly in cxx and cleaned
- Other places: some casts added to avoid warnings

src/Extrema/Extrema_GLocateExtCC.gxx

@@ -30,14 +30,6 @@ Extrema_GLocateExtCC::Extrema_GLocateExtCC (const Curve1&       C1,
 					    const Standard_Real U0,
 					    const Standard_Real V0)
 {
-
-#ifdef DEB
-  GeomAbs_CurveType type1 = Tool1::GetType(C1);
-  GeomAbs_CurveType type2 = Tool2::GetType(C2);
-#else
-  Tool1::GetType(C1);
-  Tool2::GetType(C2);
-#endif
   Standard_Real TolU = C1.Resolution(Precision::Confusion());
   Standard_Real TolV = C2.Resolution(Precision::Confusion());
   Extrema_POnCurv P1, P2;

src/Extrema/Extrema_GLocateExtCC2d.gxx

@@ -37,13 +37,6 @@ Extrema_GLocateExtCC2d::Extrema_GLocateExtCC2d (const Curve1&       C1,
 						const Standard_Real U0,
 						const Standard_Real V0)
 {
-#ifdef DEB
-  GeomAbs_CurveType type1 = Tool1::GetType(C1);
-  GeomAbs_CurveType type2 = Tool2::GetType(C2);
-#else
-  Tool1::GetType(C1);
-  Tool2::GetType(C2);
-#endif
   Standard_Real TolU = Tool1::Resolution(C1, Precision::Confusion());
   Standard_Real TolV = Tool2::Resolution(C2, Precision::Confusion());
   Extrema_POnCurv2d P1, P2;

src/Extrema/Extrema_GLocateExtPC.gxx

@@ -113,11 +113,6 @@ void Extrema_GLocateExtPC::Perform(const ThePoint&     P,
 				   const Standard_Real U0)
 {
   Standard_Integer i, i1, i2, inter;
-#ifdef DEB
-  Standard_Real Tol = TheCurveTool::Resolution(*((TheCurve*)myC), Precision::Confusion());
-#else
-  TheCurveTool::Resolution(*((TheCurve*)myC), Precision::Confusion());
-#endif
   Standard_Real Par, valU, valU2 = RealLast(),
   local_u0 ;
   Standard_Real myintuinf=0, myintusup=0;