Specify which stencil entries are constant over the grid.
Specify which stencil entries are constant over the grid. Declaring entries to be ``constant over the grid'' yields significant memory savings because the value for each declared entry will only be stored once. However, not all solvers are able to utilize this feature.Presently supported:
- no entries constant (this function need not be called)
- all entries constant
- all but the diagonal entry constant