updated subgoaler/solver/looper;

removed somewhat pointless historic material; tuned;

tuned;

updated explanation of rewrite rules;

(re)moved old material about Simplifier;

some coverage of "resolution without lifting", which should be normally avoided;

removed somewhat pointless historic material;

updated biresolve_tac, bimatch_tac; removed obscure historical material;

moved classical wrappers to IsarRef; removed somewhat pointless historic material;

avoid clash of terminology wrt. "semi-automated" in the sense of Isar (e.g. method "rule");

updated citations;

tuned;

removed junk;

removed pointless historic material;

more on Simplifier rules, based on old material;

refurbished Simplifier examples;

more on the Simplifier, based on old material;

more concise/precise documentation;

tuned text

replaced relation by function - simplifies development

made SMLNJ happier

import Sublist rather than PrefixOrder to avoid unnecessary class instantiation

prefer explicit Random.seed

dropped dead code

tuned import order

tuned layout

fixed detection of tautologies -- things like "a = b" in a structured proof, where a and b are Frees, shouldn't be discarted as tautologies

create temp directory if not already created