Extend HyTeG to work on level 1 and 0
Apparently for some P1 GMG tests (even P1-P1 Stokes) we can plug in level 1 as minimum level and it works. Level 0 could really be helpful to accelerate our coarse grid solvers.
- indexing
- functions
- operator assembly
- single level solvers (CG, PETSc suite, ...)
- grid transfer, multigrid solvers
- fix 2D
- function iterator, PETSc field split indexing
- agglomeration
-
VTK-> #116