Tuned function thm_proof.

- enter_thmx -> enter_thms - improved naming of theorems: enter_thms now takes functions pre_name and post_name as arguments

norm_hhf_eq is now stored using open_store_standard_thm.

induct: internalize ``missing'' consumes-facts from goal state (enables unstructured scripts to perform elim-style induction);

- 'induct' may now use elim-style induction rules without chaining facts, using ``missing'' premises from the goal state; this allows rules stemming from inductive sets to be applied in unstructured scripts, while still benefitting from proper handling of non-atomic statements; NB: major inductive premises need to be put first, all the rest of the goal is passed through the induction;

(induct set: ...);

put_consumes: really overwrite existing tag;

finish_global: Tactic.norm_hhf;

use HOL.induct_XXX;

use induct_rulify2;

renamed inductive_XXX to induct_XXX; added induct_impliesI;

induct_impliesI;

tuned induct proofs;

- 'induct' method now derives symbolic cases from the *rulified* rule (before it used to rulify cases stemming from the internal atomized version); this means that the context of a non-atomic statement becomes is included in the hypothesis, avoiding the slightly cumbersome show "PROP ?case" form;

tuned;

induct: cases are extracted from rulified rule;

removed obsolete make_raw;

lemma Least_mono moved from Typedef.thy to Set.thy;

tuned;

removed option -depend (not available everywhere?);

converted theory "Set";

fixed string_of_mixfix;

tuned declaration of rules;

equal_intr_rule already declared in Pure;

rules for meta-level conjunction;

tuned prove;

tuned;

added prove;

declare equal_intr_rule as intro;

tuned prove; added prove_standard;