slacker error code policy for Z3

repaired 'if' logic

killed a few 'metis' calls

honor the fact that the new Z3 can generate Isar proofs

have Sledgehammer generate Isar proofs from Z3 proofs

tuned ML interface

integrate SMT2 with Sledgehammer

removed tracing output

use 'smt2' in SMT examples as much as currently possible

moved 'SMT2' (SMT-LIB-2-based SMT module) into Isabelle

tuned proofs

dropped redundant theorems

tuned

monotonicity in complete lattices

enhanced simplifier solver for preconditions of rewrite rule, can now deal with conjunctions

tuned signature -- clarified module name;

added ML antiquotation @{here};

ML_Context.check_antiquotation still required;

simplified programming interface to define ML antiquotations -- NB: the transformed context ignores updates of the context parser; added command 'print_ML_antiquotations';

proper base comparison;

tuned;

tuned proofs;

more explicit markup and explanation of the improper status of 'back', following the AFP style-guide;

clarified Markup.operator vs. Markup.delimiter; tuned color;

more explicit markup for Token.Literal; Markup.quasi_keyword for Parse.$$$ -- it is used within Args.syntax as well; Markup.operator for name of Args.syntax, to override outer keywords like "where"; tuned signature;

tuned signature;

modernized setup;

tuned;

some document antiquotations for Isabelle/jEdit elements; modernized theory setup;

merged