removed conditional combinator;
avoid handle _;
showctxt: print_context (cf. local theory context);
searchtheorems: proper find_theorems;
refrain from setting ml_prompts again;
tuned init_pgip;
use "../settings.ML";
no_document use_thy "While_Combinator";
use_thy "simp";
use_thy "WFrec";
use_thy "Partial";