Commit 70505ff raised opm-core's "Boost" requirement to version 1.44
in order to reflect the requirements of the opm-parser module. This
commit propagates that requirement to all other known modules.
The benchmark library uses Boost::iostreams to do decompression. Since
we only scan for the Boost dependency once, this submodule is added to
all of the projects in order to have a coherent dependency on Boost.
This file can be included both in the project itself, and also in the
find module for the library, so that the list of dependencies can be
maintained in only one place.
