Change detail namespace.

Big search and replace to change name of internal namepace so it's mangled with the Boost version number - the aim is to reduce the chances of mixing different header and library versions.

include/boost/regex/v4/iterator_traits.hpp

@@ -31,7 +31,7 @@
 #endif
 
 namespace boost{
-namespace re_detail{
+namespace BOOST_REGEX_DETAIL_NS{
 
 #if defined(BOOST_NO_STD_ITERATOR_TRAITS)
 
@@ -117,7 +117,7 @@ struct regex_iterator_traits : public std::iterator_traits<T> {};
 
 #endif
 
-} // namespace re_detail
+} // namespace BOOST_REGEX_DETAIL_NS
 } // namespace boost
 
 #ifdef BOOST_MSVC