The new eclwriter output and restart using the eclIO from opm-output
All tests in opm-simulator pass and
MPI restart works.
Standard initialization is done prior to restart in order
to compute correct initial thpressure values. This is not
necessary if thpressures are written to the restart file
TODO: Some trivial fields are written out in order mimic legacy code,
this should be cleaned up
TODO: Output of wells, FIP, NNC is still done in opm-simulators.
This should be moved later.
