repaired some damage caused by merging with version from 12 days ago (cf. 8c8f27864ed1);
repaired some damage caused by merging with version from 12 days ago (cf. 8c8f27864ed1);

MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle