use SubGrid to be able to have diferent grid views in each model
Description
Use metagrid dune-subgrid so that we are able to have diferent grid views in each model.
Proposal
The idea is that each model is able to adapt the grid to its own puposes while stille sharing the same host grid with the whole simulation. dune-subgrid would give us the possibility to create our custom grid views for each model and even giving us some support for the markin of the grid. It would remain to us to create the adapters that can transfer information between entities of the two sub grids.
How to test the implementation?
Each model is still able to compute steps in the new grid views.
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