removed obsolete section "User interfaces"; removed obsolete section "Isabelle/Isar theories", moved parts to beginning of Spec.thy; removed obsolete section "How to write Isar proofs anyway?"; tuned;
removed obsolete section "User interfaces";
removed obsolete section "Isabelle/Isar theories", moved parts to beginning of Spec.thy;
removed obsolete section "How to write Isar proofs anyway?";
tuned;

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