Moved to much cleaner system of using BOOST_TT_BROKEN_COMPILER_SPEC

for handling vc6/7 deficiencies with iterator_traits.

Fixed a bug in iterator_facade which was causing incomplete types to
be passed through is_convertible.

Reinstated libs/utility/iterator_traits_test.cpp


[SVN r19840]

test/reverse_iterator_test.cpp

@@ -11,19 +11,8 @@
 
 using boost::dummyT;
 
-#ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
-namespace boost
-{
-  namespace detail
-  {
-    template<> struct iterator_traits<dummyT*>
-    : ptr_iter_traits<dummyT> {};
-    template<> struct iterator_traits<dummyT const*>
-    : ptr_iter_traits<dummyT const> {};
-  }
-}
-#endif
-
+BOOST_TT_BROKEN_COMPILER_SPEC(boost::dummyT)
+    
 // Test reverse iterator
 int main()
 {