2009-03-13 haftmann 2009-03-13 moved some generic nonsense to arith_data.ML
2009-03-12 haftmann 2009-03-12 vague cleanup in arith proof tools setup: deleted dead code, more proper structures, clearer arrangement
2008-12-31 wenzelm 2008-12-31 moved term order operations to structure TermOrd (cf. Pure/term_ord.ML); tuned signature of structure Term;
2008-12-03 haftmann 2008-12-03 made repository layout more coherent with logical distribution structure; stripped some $Id$s