Provide dependency information for opm-benchmarks
Depend on Boost::iostreams

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.
Uniformly raise Boost version requirement to 1.44

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.
Reformat prerequisite file according to convention

This commit makes a few adjustments to the white-space of file
'opm-parser-prereqs.cmake' to honour the conventions of the other
*-prereqs.cmake files within the OPM project's module suites.

No functional changes.
Depend on Boost.Iostreams

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.
Fix mis-merge.

In propagating the requirements for opm-benchmarks to the other
modules I accidentally removed the 'opm-parser' prerequisite (see
commit 86439d6 for details).  This commit restores that prerequisite.
Restore C++-11 checks

While reformatting the parser-prereqs file I accidentally replaced
the feature search 'CXX11Features' with 'CXX10Features'.  This
commit fixes that blunder.
Merge pull request #503 from bska/503_cmake

[CMake] Propagate Boost.Iostreams to all modules