register the transmissibilities at the EcliseWriter

missing: the simulator using dune-cornerpoint. Once again, this is
because there is no good way to convert an intersection to a unique
global index (yet).
Compute half transmissibilities based on local coordinate system

hTrans(cellFaceIdx) = K(cellNo,j) * sum( C(:,i) .* N(:,j), 2) /
sum(C.*C, 2),
Only for diagonal tensors, off-diagonal permeability values are ignored
without warning
Implement comments for PR#249
1) Add the possibility for the user to chose between local and global
coordinate permeability in the transmissibility calculations.
2) Trow for CpGrid
3) Add default for switch
Implement code style comments
Merge pull request #241 from andlaus/write_transmissibilities

register the transmissibilities at the EcliseWriter
Merge pull request #249 from totto82/locTrans

Compute half transmissibilities based on local coordinate system