Feature/helmsmooth3D
This MR enables the hemholtz smoother for 3D problems
It also activates PETSc MUMPS support when a Fortran compiler is present because currently, only direct solvers can reliably handle the resulting linear system.
This MR enables the hemholtz smoother for 3D problems
It also activates PETSc MUMPS support when a Fortran compiler is present because currently, only direct solvers can reliably handle the resulting linear system.