Wall Boundary condition

[David Monfort]

Hi Gauthier,
I just wanted to add a precision on the multigrid algorithm: it shouldn't be used in version 1.3 ;-)
As Alexandre wrote, it really was a prototype and it is know to have some issues (convergence issues on some cases, and parallelism issues in general). It has been largely improved in version 1.4, and later again (and we are still working on it!).
David