- Fixed cutrewrite bug #2021 introduced in commit 11662 (as a side

  effect, old cut_replacing was betaiota-normalizing, new
  cut_replacing, from commit 11662, does not; turn
  betaiota-normalisation into a purer and simpler whd_beta of the
  abstracted rewriting predicate to the rewritten term).
- Made "induction in" more flexible when induction is on a goal variable
  (accept occurrences -- even if theoretically unnecessary -- so as e.g. 
   not to expand occurrences that would otherwise trigger reductions -
   see example in Peano.mult_succ_r).



git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@11697 85f007b7-540e-0410-9357-904b9bb8a0f7

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