Sat, 12 Apr 2008 17:00:48 +0200 wenzelm replaced Drule.close_derivation/Goal.close_result by Thm.close_derivation (removed obsolete compression);
Sat, 12 Apr 2008 17:00:47 +0200 wenzelm advance: do not count utf8 trailer bytes (which happen to be undefined or punctuation in iso-latin);
Sat, 12 Apr 2008 17:00:47 +0200 wenzelm added is_utf8_trailer;
Sat, 12 Apr 2008 17:00:45 +0200 wenzelm rep_cterm/rep_thm: no longer dereference theory_ref;
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