get rid of two-year-old hack, now that the "metis" skolemizer no longer gets stuck in HO unification
get rid of two-year-old hack, now that the "metis" skolemizer no longer gets stuck in HO unification

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