Merge unordered and hash from trunk.

- Only use Visual C++ pragma with appropriate compilers.
- Working link for Thomas Wang's hash function.
- Updated unordered rationale.
- Fix `unnecessary_copy_tests` for Visual C++ 12.
- Some extra insert tests.


[SVN r86728]

hash/doc/rationale.qbk

@@ -34,7 +34,7 @@ For other use cases, if you do need a higher quality hash function,
 then neither the standard hash function or `boost::hash` are appropriate.
 There are several options
 available. One is to use a second hash on the output of this hash
-function, such as [@http://www.concentric.net/~ttwang/tech/inthash.htm
+function, such as [@http://web.archive.org/web/20121102023700/http://www.concentric.net/~Ttwang/tech/inthash.htm
 Thomas Wang's hash function]. This this may not work as
 well as a hash algorithm tailored for the input.
 

include/boost/functional/hash/hash.hpp

@@ -29,11 +29,15 @@
 
 #if defined(BOOST_MSVC)
 #pragma warning(push)
+
+#if BOOST_MSVC >= 1400
 #pragma warning(disable:6295) // Ill-defined for-loop : 'unsigned int' values
                               // are always of range '0' to '4294967295'.
                               // Loop executes infinitely.
 #endif
 
+#endif
+
 #if BOOST_WORKAROUND(__GNUC__, < 3) \
     && !defined(__SGI_STL_PORT) && !defined(_STLPORT_VERSION)
 #define BOOST_HASH_CHAR_TRAITS string_char_traits