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When running the tests in parallel the box- and tpfa-specific tests were
using and overwriting the same grid file, which lead to invalid grids
during the convergence tests.

* Now: // Add model specific output fields

Depending on the Dune version, the boundary markers are present on
all processes (<= 2.6) or on the root process only (>= 2.7). Try to
handle this in a flexible way in the corresponding data handle:
Determine if the minimum size over all processes of the boundary
markers vector is zero. If yes, assume that the root process contains
all markers and broadcast them.

Currently, it isn't possible to refine a parallel UGGrid that has
been read by a GmshReader, see dune-grid issue #83. Therefore, don't
refine in the corresponding test.

* Always compare the last vtu file
* Set maximum time step size lower
* Set Newton and linear solver tolerance lower

Dennis Gläser authored Nov 12, 2018 and Timo Koch committed Dec 04, 2018

this jump should be independent of the choice for xi, which is why
here we test if for different values of xi the same reference solution
is obtained.