Split sp_counted_base into no threads (nt), win32 lock-free (w32) and pthreads (pt)

[SVN r27729]
<intrin.h> appears broken.

[SVN r27737]
New version of call_once for win32

[SVN r30847]
Added interlocked compare/exchange for pointers, and interlocked_read for values and pointers

[SVN r30941]
InterlockedCompareExchangePointer is only intrinsic on 64 bit platforms, otherwise it's just a synonym for InterlockedCompareExchange

[SVN r30951]
Added InterlockedExchangePointer

[SVN r31010]
Added BOOST_INTERLOCKED_EXCHANGE_POINTER in all branches of the #if

[SVN r31012]
Removed :: qualification on _Interlocked functions

[SVN r31097]
Moved BOOST_INTERLOCKED_READ stuff into its own header

[SVN r31098]
Win32 implementation of boost::timed_mutex

[SVN r33272]
Windows CE patch by Michael Fink

[SVN r33986]
config, detail, filesystem, system, tools, at 41278.

[SVN r41316]
Merged 43316, 43317, 43318, 43733, 43782, 43873, 43888, 43916, 43950, 44055, 44056, 44058, 44073, 44074, 44132, 44137, 44138, 44140, 44344 from trunk to release

[SVN r47339]
Merge [57958] to release. Fixes #3378.

[SVN r58069]
Merged fix for issue #4849 from trunk (fix boost.thread on mingw64) (authorized by rene)

[SVN r72657]
Merge [75396] to release. Fixes #4678.

[SVN r75757]
Thread: Updated from trunk 1.52

[SVN r80473]
Merged revision(s) [80935] from trunk: Fix the _WIN32_WCE >= 0x600 case.

[SVN r80960]
Merged latest changes from trunk.

[SVN r85988]
Merged revision(s) 85994 from trunk: Add BOOST_USE_INTRIN_H support; remove #pragma intrinsic, not needed and not supported on Intel. Refs #6646. Refs #7318. Refs #9174.

[SVN r86416]