[PR #274] Replace Boost.MPL with Boost.MP11

Subject: [PR #274] Replace Boost.MPL with Boost.MP11
From: Mateusz Loskot (mateusz_at_[hidden])
Date: 2019-04-02 22:41:15

Hi,

I have submitted a very large PR that ports GIL develop branch
from Boost.MPL to Boost.MP11 and  C++11 type traits:

https://github.com/boostorg/gil/pull/274

Apart from failing one of legacy tests (see PR description), which
I'm going to investigate soon, the porting work is completed.
Apart from two headers mentioned in the PR description,
there should be no references to boost::mpl namespace or
includes of <boost/mpl/*.hpp> headers left.

It is ready to review.

Every pair of eyes is welcome!

Best regards,
-- 
Mateusz Loskot, http://mateusz.loskot.net