FEATURE: BOOST_FUSION_ADAPT_STRUCT can now also be called completely with
variadics arguments.

The following signature is possible :

 BOOST_FUSION_ADAPT_STRUCT(
        struct_name,
        member_name0,
        (BOOST_FUSION_ADAPT_AUTO, member_name1)
        (member_type2, member_name2)
	member_name3,
        ...
        )