replaced calls to PropLogic.auxcnf by PropLogic.defcnf again

comment modified

write_dimacs_sat_file writes outer parentheses again

replaced calls to PropLogic.defcnf by PropLogic.auxcnf

minor parameter changes

defcnf renamed to auxcnf, new defcnf algorithm added, simplify added

Added two new theories to HOL/Library: SetsAndFunctions.thy and BigO.thy

defcnf modified to internally use a reference

dead code removal

reformatting and tidying

tidied up the tracing output

streamlined the tptp output

removed unused code

Tuned comment.

Rewrote function remove_suc, since it failed on some equations produced by recdef.

write_dimacs_sat_file now generates slightly smaller files

revised examples

code streamlining

Ressurect seq attribute accidently removed

Sort search results in order of relevance, where relevance = a) better if 0 premises for intro or 1 premise for elim/dest rules b) better if substitution size wrt to current goal is smaller Only applies to intro, dest, elim, and simp (contributed by Rafal Kolanski, NICTA)

Inttab.defined;

some structured proofs on completeness;

more contribs;

tuned;

isatool fixheaders;

with_path;

added list of theorem changes to NEWS added real_of_int_abs to RealDef.thy

added defined;

simplified union;

tuned match, unify;

tuned instantiate (avoid subst_atomic, subst_atomic_types); Logic.incr_tvar;

tuned defs interface;