[v3] tr1::array fixups

[Paolo Carlini]

Benjamin Kosnik wrote:

>        const_iterator 
>        end() const
>!       { return reinterpret_cast<iterator>(&_M_instance[_S_index - 1]); }
>
By the way, a few days ago, I have noticed that end() - beg() == size() 
- 1 != size(),
I think this is not ok: end() should point one-past-end, as always 
happens with the
other containers...

Wouldn't be better just using (_M_instance + _S_index) ??

Paolo.