Currently the simulator creats the polyhedreal grid from an eclGrid from opm-common
TODO
- make it possible to create the grid directly from DGF or MRST format
- fix issue on norne.
That the local ids were consecutive and starting from 0 was just
a coincidence and they should never be used to access linear systems
or vectors. This commit fixes this by using the correct mappers instead.
Note the we removed some computations from the constructor of
ISTLSolverEbosCpr as it inherits from ISTLSolverEbos and the operations
already happnen in constructor of the base class.
