renamed kill_all to kill, in conformance with atp_kill command;
simplified/unified treatment of preferences;
check_thread_manager: CRITICAL due to global ref;
goal addressing via Thm.cprem_of;
reduced NJ basis library stuff to bare minimum;
use "../settings.ML";
use_thy "Even";
use_thy "Mutual";
use_thy "Star";
use_thy "AB";
use_thy "Advanced";