What this MR does / why does DuMux need it: Empties doxyerr.log file for doxygen master (1.10.0 (f6f0118a9cea3f5bb2ebb79464be9846b028f275) when asking for doxygen --version). This prepares for a future update of the CI and makes doxygen more correct in terms of ingroups.
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\n character. Make sure there is no
\ No newline at end of file comment in "Changes" of this MR.