more strict typscheme_equiv check: must fix variables of more specific type; dropped dead code; tuned order
more strict typscheme_equiv check: must fix variables of more specific type;
dropped dead code;
tuned order

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