removed low-level str_of_sort/typ/term (use Display.raw_string_of_sort/typ/term instead, or even PolyML.print -- for debugging purposes);
removed low-level str_of_sort/typ/term (use Display.raw_string_of_sort/typ/term instead, or even PolyML.print -- for debugging purposes);

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