Sequence traits protocol

Sequence algorithms' traits protocol has been changed to that of metafunction classes:

Before	Now
name`_traits<Tag>::algorithm<...>::type`	name`_impl<Tag>::apply<...>::type`

Correspondingly, if your code implemented a custom sequence, it needs to be adjusted according to the above table; for example:

Before	Now
template<> struct begin_traits<my_tag> { template< typename S > struct algorithm { typedef ... type; }; };	template<> struct begin_impl<my_tag> { template< typename S > struct apply { typedef ... type; }; };

Before

Now

template<> struct begin_traits<my_tag>
{
    template< typename S > struct algorithm
    {
        typedef ... type;
    };
};

template<> struct begin_impl<my_tag>
{
    template< typename S > struct apply
    {
        typedef ... type;
    };
};