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/ExprIntrp/ExprIntrp.lex

@@ -22,6 +22,7 @@
 %option yywrap
 %{
 #include <ExprIntrp.tab.h>
+
 #define YY_SKIP_YYWRAP
 
 static YY_BUFFER_STATE ExprIntrp_bufstring;
@@ -29,6 +30,8 @@ static YY_BUFFER_STATE ExprIntrp_bufstring;
 void ExprIntrp_SetResult();
 void ExprIntrp_SetDegree();
 
+int ExprIntrlex (void);
+
 void ExprIntrp_start_string(char* str)
 {
   ExprIntrp_bufstring = ExprIntrp_scan_string(str);
@@ -45,6 +48,11 @@ int yywrap()
   return 1;
 }
 
+// disable MSVC warnings in flex code
+#ifdef _MSC_VER
+#pragma warning(disable:4131 4244 4273 4127)
+#endif
+
 %}
 %%
 " "		{;}