fix opm-parser find rule

deals with the fallout of opm-parser #365 and #366
Merge pull request #236 from akva2/fix_opmparser

fix opm-parser find rule
[bugfix] use SparseLU when UMFPack was not found.
Merge pull request #238 from dr-robertk/PR/sparselu-when-no-umfpack

[bugfix] use SparseLU when UMFPack was not found.
register the transmissibilities at the EcliseWriter

missing: the simulator using dune-cornerpoint. This is because for
Once again, this is because there is no reasonable way to convert an
intersection to a unique global index yet.