[boost] [iterator][utility] Move utility/next_prior.hpp to Iterator module?

[Michel Morin via Boost]

Do you mean coupling of Boost.Iterator and Boost.Range? I think that would
be fine, since Boost.Range already couples with Boost.Iterator.
Boost.Range's `boost::distance` should call Boost.Iterator's
`boost::distance`.

http://www.boost.org/doc/libs/1_64_0/libs/utility/utility.htm

Ah ok, got it. I think it would be better to move utility/next_prior.hpp to
the Boost.Iterator module.

After the move, the Boost.Iterator module will have:
- include/boost/iterator/next_prior.hpp
* Contains the actual code for `next` and `prior`.
(Personally, I'd like to add `boost::prev` as a synonym of `boost::prior`.)
- include/boost/utility/next_prior.hpp
* Just includes <boost/iterator/next_prior.hpp>.

This is how utility/declval.hpp was moved to the Boost.TypeTraits module.


Regards,
Michel

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