Findopm-parser.cmake: make sure that the ERT libraries are available

and some other minor cleanups to the module. For me it still works,
but this being the build system, I can't guarantee more...
Findopm-parser.cmake: invoke FindBoost unconditionally

even if boost was found previously, it might still miss a few
libraries. thanks to @akva2 for catching this.
Merge pull request #599 from andlaus/add_ERT_to_opm-parser

explicitly add the ERT libraries to the prerequisites of opm-parser
[buildsystem] Disable search for Boost in parser detection

This changeset disables the effect of commit e9a5e82.  There appears
to be an unforeseen interaction between the calls to

    Find_Package (Boost)

that are implied by module 'opm-parser-prereqs.cmake' and the one
that's directly invoked in 'Findopm-parser.cmake'.  Until the
situation can be fully analysed and a complete solution implemented,
this is a temporary measure to restore the build of opm-core and
downstream OPM modules.
Merge pull request #600 from bska/restore-build

[buildsystem] Disable search for Boost in parser detection
Split method solveSingleCell() for easier maintenance.
Removed unused debugging output.
Work in progress fixing multidim upwinding.
Fix use of assert.
added: hook for conditionally compiled files

backport from opm-upscaling PR#100
Merge pull request #602 from akva2/add_files_hook

added: hook for conditionally compiled files
fixed: dune-cornerpoint (now) needs the dune-common version information
Merge pull request #603 from akva2/fix_cp_prereqs

fixed: dune-cornerpoint (now) needs the dune-common version information
First compiling version of fixed MDU method.
Findopm-parser.cmake: Fix it up, next try

thanks to Arne Morten Kvarving, Bård Skaflestad and Roland Kaufmann
for the discussion.
Merge pull request #601 from andlaus/fix_Findopm-parser.cmake_next_try

Findopm-parser.cmake: Fix it up, next try
fixed: tutorials should include config.h conditionally
added: build system for tutorials
Merge pull request #604 from akva2/build_tutorials

Build tutorials
Add computation of face tofs parts.

This must be done after the cell tof has been computed since they
depend on it.