Why gil removed the read_image (stream, ...) function
After the gil version 49d010ba6e83a64a249d00c934642334155593c2 will not ..
That function is in an extension:
https://github.com/boostorg/gil/blob/develop/include/boost/gil/extension/io/detail/read_image.hpp
See here for more background http://www.boost.org/doc/libs/1_62_0/libs/gil/doc/html/gildesignguide.html#IO_DG