`test-parallel-ug` should be run in parallel
test-parallel-ug should eventually be run in parallel, however it currently fails with more than two processes. This probably happens due to bugs in dune-uggrid.
What needs to happen before the test can run in parallel:
- Buid dune-uggrid with MPI support (ideally by default, otherwise at least for the CI system)
- Fix the bugs in dune-uggrid that make this test fail.
As it passes with 2 processes,
test-parallel-ugshould also be run with >2 processes, but by default we limit the number of MPI ranks to 2, see dune-common#38