Merge support for emplace for compilers with rvalue references and variadic templates arguments, and better use of C++0x allocators.

Merged revisions 44058-44075,44078-44084,44086-44108,44110-44365,44367,44369-44414,44416-44419,44421-44457,44467-44469,44471-44511,44513-44535,44537-44737 via svnmerge from 
https://svn.boost.org/svn/boost/branches/unordered/trunk

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  r44467 | danieljames | 2008-04-16 18:35:56 +0100 (Wed, 16 Apr 2008) | 2 lines
  
  Add C++-0x support to the test allocators.
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  r44468 | danieljames | 2008-04-16 18:36:06 +0100 (Wed, 16 Apr 2008) | 2 lines
  
  Add a C++-0x node_constructor.
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  r44469 | danieljames | 2008-04-16 18:36:16 +0100 (Wed, 16 Apr 2008) | 2 lines
  
  C++-0x constructor for node.
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  r44516 | danieljames | 2008-04-17 21:41:48 +0100 (Thu, 17 Apr 2008) | 16 lines
  
  Merge in my work so far on implementing emplace for compilers with variadic
  template & rvalue references.
  
  Merged revisions 44059-44062 via svnmerge from 
  https://svn.boost.org/svn/boost/branches/unordered/dev
  
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    r44059 | danieljames | 2008-04-05 17:41:25 +0100 (Sat, 05 Apr 2008) | 1 line
    
    First stab at implementing emplace - only for compilers with variadic template & rvalue references.
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    r44062 | danieljames | 2008-04-05 19:12:09 +0100 (Sat, 05 Apr 2008) | 1 line
    
    Better variable template arguments, need to add proper support to BoostBook.
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  r44616 | danieljames | 2008-04-20 13:30:19 +0100 (Sun, 20 Apr 2008) | 1 line
  
  Merge with trunk, fixes tabs.
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  r44618 | danieljames | 2008-04-20 13:42:38 +0100 (Sun, 20 Apr 2008) | 2 lines
  
  Some extra compile tests.
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  r44619 | danieljames | 2008-04-20 13:42:50 +0100 (Sun, 20 Apr 2008) | 2 lines
  
  Fix an error message.
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  r44703 | danieljames | 2008-04-21 20:19:50 +0100 (Mon, 21 Apr 2008) | 15 lines
  
  Merge latest changes from trunk.
  
  Merged revisions 44616-44702 via svnmerge from 
  https://svn.boost.org/svn/boost/trunk
  
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    r44650 | danieljames | 2008-04-20 22:08:57 +0100 (Sun, 20 Apr 2008) | 1 line
    
    Update an include.
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    r44697 | danieljames | 2008-04-21 16:55:40 +0100 (Mon, 21 Apr 2008) | 1 line
    
    Factor out the code for choosing the bucket count, and which bucket that hash values map to make it easier to experiment with alternative policies.
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  r44733 | danieljames | 2008-04-23 07:55:43 +0100 (Wed, 23 Apr 2008) | 2 lines
  
  Remove 'reserve_extra'.
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  r44734 | danieljames | 2008-04-23 07:55:55 +0100 (Wed, 23 Apr 2008) | 2 lines
  
  More unnecessary copy tests - showing some weakness in the emplace implementation.
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  r44735 | danieljames | 2008-04-23 07:56:06 +0100 (Wed, 23 Apr 2008) | 2 lines
  
  More tests.
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  r44736 | danieljames | 2008-04-23 07:56:19 +0100 (Wed, 23 Apr 2008) | 2 lines
  
  Comment out a test which requires a C++0x std::pair.
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  r44737 | danieljames | 2008-04-23 07:56:35 +0100 (Wed, 23 Apr 2008) | 2 lines
  
  Avoid creating unnecessary copies in unordered_set::emplace and unordered_map::emplace.
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[SVN r44738]

include/boost/unordered/detail/hash_table.hpp

@@ -32,6 +32,13 @@
 
 #include <boost/mpl/aux_/config/eti.hpp>
 
+#if defined(BOOST_HAS_RVALUE_REFS) && defined(BOOST_HAS_VARIADIC_TMPL)
+#include <boost/type_traits/remove_reference.hpp>
+#include <boost/type_traits/remove_const.hpp>
+#include <boost/utility/enable_if.hpp>
+#include <boost/mpl/not.hpp>
+#endif
+
 #if BOOST_WORKAROUND(__BORLANDC__, <= 0x0582)
 #define BOOST_UNORDERED_BORLAND_BOOL(x) (bool)(x)
 #else