Various little improvements:

- A new [dependent pattern] tactic to do a pattern on an object in an
inductive family and generalize by both the indexes and the object
itself. Useful to prepare a goal for elimination with a dependent
principle.
- Better dependent elimination simplification tactic that doesn't
throw away non-dependent equalities if they can't be injected.
- Add [fold_sub] and [unfold_sub] tactics for folding/unfolding
well-founded definitions using measures built by Program.


git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@11420 85f007b7-540e-0410-9357-904b9bb8a0f7

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