- Remove BOOST_PARSER_STANDALONE, and make that the default. The bits of
Boost that we might use are used automatically when they're available (as
discovered via __has_include).
- Remove the non-essential uses of Boost from the examples.
constants like llong; provide a tuple accessor get(); use these throughout the
code.
Also, adapt the code in detail/hl.hpp to work with hana::tuple and std::tuple.