moved gen_eq_set to library.ML;

added ~$$ (negative literal); combinators: avoid code duplication; tuned extend_lexicon;

avoid polymorphic equality;

remove (op =); tuned;

gen_eq_set, remove (op =);

abbreviation upto, length;

added subtract; tuned;

subtract (op =);

remove (op =);

Now SML/NJ-friendly (IntInf)

Removal of unnecessary simprules: simproc cancel_numerals now works without add_Suc, while the reason for the horrible isolateSuc is not known.

interpret: Proof.assert_forward_or_chain;

subsetI is often necessary

Now the setup for cancel_numerals accepts mixed Sucs/+ where the Sucs no longer need to be outermost.

Tuned signature of Locale.add_locale(_i).

simplified mg_domain (use Sign.classes/arities_of); removed unused lift_local_theory_yield;

made $$ and "this" monomorphic (string);

tuned;

export arities_of instead of classes_arities_of;

updated;

renamed const less to lt;

renamed constant less in lattice

fixed problem with proof reconstruction by adding add_Suc to arith-simpset.

added parser locale_expr_unless

fixed clsvar bug

add_locale(_i) returns internal locale name.

added example for operational classes and code generator

slight improvement in serializer, stub for code generator theorems added