add RV keyword

For now, this is required to read in the initial condition of Norne...
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.
Merge pull request #133 from andlaus/raw_data_in_wconinje_wrapper

use raw values for context dependent rates in the wrapper of WCONINJE
Merge pull request #132 from andlaus/add_rv

add RV keyword
Merge pull request #134 from bska/uniform-parser-prereqs

Uniform parser 'prereqs' file
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 #135 from bska/restore-c++11

Restore C++-11 checks
Suppress unused argument warnings.
Merge pull request #136 from atgeirr/suppress-warnings

Suppress unused argument warnings.
Added check on Well->status before reading controlmode.
Made sure that groups were added when reading the GRUPTREE keyword.
Added throw() in Schedule if trying to control well on an item which has been defaulted.
Added two new keywords.
Merge pull request #138 from joakim-hove/SWCR-Keywords

Added two new keywords.
Changed installation of keywords to use a plain recursive install without consulting git.
Merge pull request #139 from joakim-hove/cmake-install-no-git

Changed installation of keywords to use a plain recursive install withou...
Explicitly set the output path for bin/ and lib/ output from the build process.
Merge pull request #140 from joakim-hove/binary-build-output-path

Explicitly set the output path for bin/ and lib/ output from the build
TimeMap: fix the timePassedUntil() method

whoever wrote the original code must have his brain left in the bed
that day ;)...