Merge branch 'fix/editor-hints' into 'master'

Add editor hints to variablesizecommunitationtest.cc

See merge request core/dune-common!414

dune/common/parallel/test/variablesizecommunicatortest.cc

+// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+// vi: set et ts=4 sw=4 sts=4:
 #include <config.h>
 
 #include <cstddef>