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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.

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.

Fix #579 where is was noted that 1.0 as default is more a disadvantage
than an advantage. Just specify 1.0 in the input file explicitly
instead.

* makes calls to NEW_PROP_TAG unique which will be required by the new property system