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_thy "FP0";
use_thy "FP1";
use_thy "RECDEF";
use_thy "Rules";
use_thy "Sets";
use_thy "Ind";