[PATCH] Add std::pointer_traits.

[Piotr Rak]

Hi,

I have prototyped std::scoped_allocator_adapter and other
prerequisities (using nested struct instead of template alias for
rebind members). Only std::pointer_traits is in usable state so far,
due to fronted bug, but not very useful alone. How do you think, we
should proceed with those additions?

PS. Also attached not very good tested, and with missing member test,
allocator_traits implementation.
I still have to work on ugliyfing uses_allocator and and
scoped_allocator adapter itself.


Piotr
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