moved pos/negDivAlg_induct declarations to Integ/IntDiv.thy;
change_simpset;
removed obsolete/experimental context components (superceded by Simplifier.the_context);
more abstract change_simpset(_of);
tuned;
added set/addloop' for simpset dependent loopers;
simpset: added context field with the_context, set_context;
added inherit_context (inherits bounds as well);
removed obsolete inherit_bounds;
functor: no Simplifier argument;
change_simpset;
change_claset(_of): more abtract interface;
claset_of: init proof context;
added raw get_claset;
functor: no Simplifier argument;
export change_clasimpset;
change_claset/simpset;
Simplifier.inherit_context instead of Simplifier.inherit_bounds;