Spatially-variable dissipation coefficients
Create an option to have spatially-variable dissipation coefficients, to be used with the Schmidt transform and unstructured meshes. API :
- during init, compute 2D array(s) (which grid ?) of factors multiplying the constant factor, given as input : stretching factor / local resolution.
- parameters (run.def) : ?
- use this dissipation factor in the 3 dissipation routines
- take care of Courant stability condition