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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.