RFC, DO NOT MERGE!! Implement transmissibilty and pore volume multipliers

This time, I'm reasonably sure that it is correct but I would like to
get some feedback. Note that this patch implies the
removal/disablement of all tests and simulators that don't have an
EclipseState object (as discussed in today's hangout) and that,
because this patch is a RFC implemtation, it does not work with
Dune::CpGrid (mainly due to some missing functionallity in the
AutoDiffGrid wrappers which I did not know how to fix. In particular
the `cell_facetag` seems to be hard to get hold of with CpGrid, at
least if it is desired not to do an iteration over the whole grid.)