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.
Fix bugs in MDU.
Activate MDU option, making SMU method its default.
Add tracers_ensure_unity parameter.

When this boolean parameter is true (the default), tracer solutions
will be normalized so that the tracer averages will sum to one in each cell.
This behaviour is the same as before, the change is that it can now be
turned off.
Clean up dead code for MDU, update comment.
Remove unused data member.