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ZF/indrule/mutual_ind_tac: backtracks using DEPTH_SOLVE to be certain of
solving the subgoal. Entire tactic is enclosed in DETERM to prevent
backtracking between subgoals.

ZF/EquivClass/congruent_commuteI: uncommented and simplified proof

ZF/ZF.ML/UN_iff, INT_iff: added to the signature

Pure/thm/norm_term_skip: new, for skipping normalization of the context
Pure/thm/bicompose_aux: now computes nlift (number of lifted assumptions in
new subgoals) and avoids normalizing the first nlift assumptions in the
case where the proof state is not affected.
Pure/thm/norm_term_skip: now normalizes types of parameters
Pure/thm/THM: aligned colons

Pure/sequence: added comment explaining that memoing sequences were found
to be much slower (due to overheads) than the sequences currently used.

Pure/envir/norm_term: replaced equality test for [] by null