0024234: occt master is not compiled by VC++ 2005 (vc8 32/64 bit TKBO)

Fixed building by VS 2005 and VS 2013 (Express):
- macro _WIN32_WINNT defined in BOPCol_TBB.hxx for building with TBB on VS 2005
- compiler warnings specific for VS 2005 (vc8) fixed (explicit casts added in assignment expressions involving small integer types)
- definition of functions atanh, acosh, asinh is avoided for vc12 and later (they are provided by CRT in vc12)
- math constants (M_PI and similar) are defined by including math.h rather than by custom code
- misuse of stream operator << fixed in a few places

src/BOPCol/BOPCol_TBB.hxx

@@ -21,6 +21,13 @@
 
 #ifdef HAVE_TBB
 
+// On Windows, function TryEnterCriticalSection has appeared in Windows NT
+// and is surrounded by #ifdef in MS VC++ 7.1 headers.
+// Thus to use it we need to define appropriate macro saying that we wil
+// run on Windows NT 4.0 at least
+#if ((defined(_WIN32) || defined(__WIN32__)) && !defined(_WIN32_WINNT))
+  #define _WIN32_WINNT 0x0501
+#endif
 
 #include <tbb/tbb.h>
 using namespace tbb;
@@ -28,7 +35,6 @@ using namespace tbb;
 #define flexible_range blocked_range
 #define flexible_for   parallel_for
 
-
 #else // not HAVE_TBB
 
 #define flexible_range serial_range