if one of the files matches (fuzzyly, obviously), the test counts as
passed if none matches it counts as failed. this lets us add reference
results for hosts that need the same number of time steps, but for
whatever reason produce a different result. also, the number of time
steps required to produce the result do not matter anymore, as long as
the data is the same (in the fuzzy sense).
- run one simulation in parallel if MPI is available
- test the parameter passing infrastructure
- reduce end time of the navier stokes problem to 1e-3 to make it pass
on the first try
- add CUSTOM_CXX_FLAGS to CMakeLists.txt to allow passing compiler
flags from the command line to make clang shut up about the dune
issues it encounters.
