Remove use of obsolete BOOST_APPEND_EXPLICIT_TEMPLATE_TYPE{,_SPEC} macro.

[SVN r85896]
Regex: Remove ATL specific define for old MSVC.

[SVN r85913]
Regex: Remove use of obsolete macro for template types and args.

[SVN r85914]
Regex: Remove obsolete MSVC version checks.

[SVN r85921]
Regex: Remove obsolete MSVC version check.

[SVN r86020]
Regex: Remove obsolete GCC version checks.

[SVN r86065]
Simplify multi-component ifdefs containing BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION

[SVN r86248]